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• Photo transfer problems from camera

  - by warkior

  We have a digital camera (Cannon SX130 IS) which we often connect to the Ubuntu 12.10 desktop via USB in order to download the images. In past flavours of Linux (Mint 12 was most recent) it worked fine, however since upgrading to Ubuntu 12.10, the process fails after downloading a small number of the images. I can view the images which will be transferred in the preview window, and I can browse the camera file system to download the images manually, but if I just drag/drop the images over from camera to desktop, it freezes after 5-6 are copied over. I've been able to get around the problem by only copying 3-4 at a time, but when you have 100+ images to transfer, that gets really frustrating. Any advice on where I could start looking for answers, or how I could diagnose the source of the problem further? We have also had some issues with WireLess USB mice though it may not be related. I'm hoping my USB controller in the computer isn't dying... it's not that old. Also, it seems to work much better under Windows.

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• My computer will not reboot after fresh install of ubuntu 12.04LTS

  - by user170715

  I bought a new computer yesterday and it came with Windows 8. When installing Ubuntu, i choose the erase and install option thinking that Ubuntu would install easily like it did for my old laptop... After a successful install and following the instructions telling me to reboot to finish installation and remove installation media. It worked and my computer booted fine, however once I began installing updates via update manager and activating additional driver {ATI/AMD proprietary FGLRX graphics driver (post-release updates)} out of the following: Experimental AMD binary Xorg driver and kernel module ATI/AMD proprietary FGLRX graphics driver (*experimental*beta) ATI/AMD proprietary FGLRX graphics driver (post-release updates) Then reboot to finish making changes I reboot and get an error (Reboot and select proper boot device) At this point I was stuck, so I eventually reinstalled ubuntu and repeated the exacted same steps until right before i rebooted to finish making changes. However this time i used this Boot Repair tool sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt-get update sudo apt-get install -y boot-repair boot-repair After running the program i get a "boot successfully repaired" message. Then I try to reboot again and get the GNU Grub screen where it says would you like to boot: normal recovery memorytest Once it begins loading, you see the code moving across the screen then it pauses when it gets to and doesnt do anything. If someone could tell me how to fix this or get Windows 8 back soon, I'd appreciate it because like i said i just bought it yesterday and now i cant even use it.

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• dpkg reporting as installed, uninstalled kernels

  - by Tony Martin

  I have run the following command to remove old kernels: dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge and only the current kernel is now installed, which I have confirmed in synaptic and by checking my boot partition. However, when I run: dpkg --list | grep linux-image I get the following response: rc linux-image-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP rc linux-image-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP ii linux-image-3.13.0-34-generic 3.13.0-34.60 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP rc linux-image-extra-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP rc linux-image-extra-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP ii linux-image-extra-3.13.0-34-generic 3.13.0-34.60 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP ii linux-image-generic 3.13.0.34.40 amd64 Generic Linux kernel image Probably not a problem, but just wondering why versions -30 and -32 are reported as present. Can it be rectified? TIA

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• Business knowledge in a large financial org?

  - by Victor

  As a programmer working in the finance industry, I recently got a project that is a hedge fund adminsitrative application(used to calculate NAVs, allocate assets etc.) From a business point of view this is a good thing. When we think of our 'next' project, typically the impulse is to think in terms of technology. e.g: 'I want to work on a project that uses SOA/cloud etc etc.' I am interested to know if anyone while career planning also takes into account the business aspect of a future project. i.e. what the application does. So does anybody ever think like this : 'I wish to work on a trading system so I can understand capital markets better.' instead of 'I want to work on a project that uses SOA/cloud etc etc.' I say this because it appears to me in the finance domain, for senior position, good business knowledge pays well. So maybe a guy that knows more business but maybe not so much latest technologies is at an advantage? The rockstar programmer seems more suited for an aggressive startup. Particularly big old finance orgs rarely invest in tech just for the 'cool factor'. No?

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• Extreme Portability: OpenJDK 7 and GlassFish 3.1.1 on Power Mac G5!

  - by MarkH

  Occasionally you hear someone grumble about platform support for some portion or combination of the Java product "stack". As you're about to see, this really is not as much of a problem as you might think. Our friend John Yeary was able to pull off a pretty slick feat with his vintage Power Mac G5. In his words: Using a build script sent to me by Kurt Miller, build recommendations from Kelly O'Hair, and the great work of the BSD Port team... I created a new build of OpenJDK 7 for my PPC based system using the Zero VM. The results are fantastic. I can run GlassFish 3.1.1 along with all my enterprise applications. I recently had the opportunity to pick up an old G5 for little money and passed on it. What would I do with it? At the time, I didn't think it would be more than a space-consuming novelty. Turns out...I could have had some fun and a useful piece of hardware at the same time. Maybe it's time to go bargain-hunting again. For more information about repurposing classic Apple hardware and learning a few JDK-related tricks in the process, visit John's site for the full article, available here. All the best,Mark

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• Building a complete program?

  - by Bob

  Reading books, watching videos, and reviewing tutorials is all very easy. Taking notes and actually learning the material may be slightly harder, but even then, anyone with a decent brain and a fair amount of interest, it's easy enough (not to mention, fun). The thing is, it doesn't really prepare you to write a full program or website. Let's say you're those teens (only in highschool, no true (college level) computer science or programming courses, and no real world experience), and you come out with Groupon. Or even Mark Zuckerburg, sure he was a genius, and he was a very capable programmer... but how? How do you recommend that people who are not necessarily new to programming, but new to programming real applications and real programmers go about developing it? What is the "development process" - especially for single programmers (or maybe 2-3 teens)? Also, as far as web development goes, what is the process? Was something like Facebook or Groupon written with a framework (like CodeIgniter or Zend for PHP)? Or do they develop their own frameworks? I'm not asking how to come up with a great idea, but how to implement great ideas in an effective way? Does anyone have advice? I've read a couple of books on both C and C++ (primarily the C Programming Language and the C++ Programming Language) and taken AP Computer Science (as well as read a few additional books on Java and OOP). I also have read a few tutorials on PHP (and CodeIgniter) and Python. But I'm still in highschool, and I'm technically not even old enough to work at an internship for a few more months.

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• How to make a text search template?

  - by Flipper

  I am not really sure what to call this, but I am looking for a way to have a "template" for my code to go by when searching for text. I am working on a project where a summary for a piece of text is supplied to the user. I want to allow the user to select a piece of text on the page so that the next time they come across a similar page I can find the text. For instance, lets say somebody goes to foxnews.com and selects the article like in the image below. Then whenever they go to any other foxnews.com article I would be able to identify the text for the article and summarize it for them. But an issue I see with this is for a site like Stack Exchange where you have multiple comments to be selected (like below) which means that I would have to be able to recursively search for all separate pieces of text. Requirements Be able to keep pieces of text separate from each other. Possible Issues DIV's may not contain ids, classes, or names. A piece of text may span across multiple DIVs How to recognize where an old piece of text ends and a new begins. How to store this information for later searching?

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• What "file system" is supported by Windows and Linux?

  - by Skiroid

  I'm setting up a media centre for my living room so that I'm able to watch downloaded films and TV shows on the big screen. The media centre is an old small computer which will have XBMCbuntu 12 installed on it. Right now, the media centre has a 300 GB HDD partitioned into two: 1) Ext4 50 GB (where I'll install the OS) 2) swap 6 GB (swap area) I'm wanting a third partition which I can store all my media on to. This partition will fill the rest of my HDD. Although, I'm stuck on which file system I should set it to. I need the file system to be fully compatible with Windows as I'm going to be removing the HDD from the media centre and plugging it into my main PC, running Windows 8, to transfer the media onto it. I can't transfer over Wi-Fi as the media centre won't be connected to the Internet. My options are: Ext4 journaling, Ext3 journaling, Ext2 journaling, ReiserFS journaling, btrfs journaling, JFS journaling, XFS journaling, FAT16 and FAT32. I know that FAT32 is compatible with Windows but it can only hold files that are 4 GB or less and my films are well over 4 GB. Some more than 10 GB. Is there a file system I can use which is supported by Linux and pops up under Computer in Windows?

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• World Location issues with camera and particle

  - by Joe Weeks

  I have a bit of a strange question, I am adapting the existing code base including the tile engine as per the book: XNA 4.0 Game Development by example by Kurt Jaegers, particularly the aspect that I am working on is the part about the 2D platformer in the last couple of chapters. I am creating a platformer which has a scrolling screen (similar to an old school screen chase), I originally did not have any problems with this aspect as it is simply a case of updating the camera position on the X axis with game time, however I have since added a particle system to allow the players to fire weapons. This particle shot is updated via the world position, I have translated everything correctly in terms of the world position when the collisions are checked. The crux of the problem is that the collisions only work once the screen is static, whilst the camera is moving to follow the player, the collisions are offset and are hitting blocks that are no longer there. My collision for particles is as follows (There are two vertical and horizontal): protected override Vector2 horizontalCollisionTest(Vector2 moveAmount) { if (moveAmount.X == 0) return moveAmount; Rectangle afterMoveRect = CollisionRectangle; afterMoveRect.Offset((int)moveAmount.X, 0); Vector2 corner1, corner2; // new particle world alignment code. afterMoveRect = Camera.ScreenToWorld(afterMoveRect); // end. if (moveAmount.X < 0) { corner1 = new Vector2(afterMoveRect.Left, afterMoveRect.Top + 1); corner2 = new Vector2(afterMoveRect.Left, afterMoveRect.Bottom - 1); } else { corner1 = new Vector2(afterMoveRect.Right, afterMoveRect.Top + 1); corner2 = new Vector2(afterMoveRect.Right, afterMoveRect.Bottom - 1); } Vector2 mapCell1 = TileMap.GetCellByPixel(corner1); Vector2 mapCell2 = TileMap.GetCellByPixel(corner2); if (!TileMap.CellIsPassable(mapCell1) || !TileMap.CellIsPassable(mapCell2)) { moveAmount.X = 0; velocity.X = 0; } return moveAmount; } And the camera is pretty much the same as the one in the book... with this added (as an early test). public static void Update(GameTime gameTime) { position.X += 1; }

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• Checking for collisions on a 3D heightmap

  - by Piku

  I have a 3D heightmap drawn using OpenGL (which isn't important). It's represented by a 2D array of height data. To draw this I go through the array using each point as a vertex. Three vertices are wound together to form a triangle, two triangles to make a quad. To stop the whole mesh being tiny I scale this by a certain amount called 'gridsize'. This produces a fairly nice and lumpy, angular terrain kind of similar to something you'd see in old Atari/Amiga or DOS '3D' games (think Virus/Zarch on the Atari ST). I'm now trying to work out how to do collision with the terrain, testing to see if the player is about to collide with a piece of scenery sticking upwards or fall into a hole. At the moment I am simply dividing the player's co-ordinates by the gridsize to find which vertex the player is on top of and it works well when the player is exactly over the corner of a triangle piece of terrain. However... How can I make it more accurate for the bits between the vertices? I get confused since they don't exist in my heightmap data, they're a product of the GPU trying to draw a triangle between three points. I can calculate the height of the point closest to the player, but not the space between them. I.e if the player is hovering over the centre of one of these 'quads', rather than over the corner vertex of one, how do I work out the height of the terrain below them? Later on I may want the player to slide down the slopes in the terrain.

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• Step 2 of instructions is not clear to me

  - by Albert Frye

  I want to make a bootable USB stick. I run the UUI. I see the instructions on this site: http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows Step 1 says: Select "Ubuntu Desktop Edition" from the dropdown list Okay, so the actual title of the drop down box is: Select a "Linux Distribution" from the dropdown to put on your USB I am pretty new to computers. 67 years old. Live alone. Bought my first computer 3 months ago. So I will have to assume that when the instructions say "Ubuntu Desktop Edition", that means the same thing as "Linux Distribution". Okay, No big leap there. So far, so good . . . . . . . So I pick the very first selection: Ubuntu 13.10 Desktop i386 I'm not sure why there are so many choices, but I'm guessing I'm pretty safe with the first one. It's for a Toshiba Satellite laptop 64 bit Windows 7. Okay, now for step 2: The instructions say: Click 'Browse' and open the downloaded ISO file. The message in the window just before the "Browse" button says: Browse to your ubuntu-13.10*desktop*i386.iso -- Okay, so where's that file? So I click "Browse" and start looking for that file. It is nowhere to be found. So where the heck is it?

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• 301 redirect: Is this good or bad for 2 domains?

  - by Tim

  Since i couldn't find any appropriate answer to my specific question, I wanted to ask you. I've read alot of things about the 301-redirect for moving pages and so on. A customer of mine has booked a new domain last year for better search results (he included his main keyword into the domain. Before he had only a domain with his business name, which had nothing to say about what he does). I told him, that he should do a 301-redirect so he doesn't loose his position in Google and to redirect all new customers coming from the old domain to the new domain. After about one year where his site hat a good amount of traffic the search results of Google for his keywords are getting more worse. Since he didn't maintain his website (no new content, bad content on all pages and so on) I assumed this would be the problem. He gave his website to another company which also makes websites. They told him, that this 301-redirection is very bad for his website. They removed it, and also updated his content and the template so now he has the same meta keywords on every page (instead of the specific ones I put there before). He also removed the canonical-tag which I placed there to ensure no duplicate content. What I am now afraid of is, that without this redirect Google now will find duplicate content and therefore kick him out of the index, which would be a nightmare, since most of his customers come over his website. I need verification of the fact, that the 301 isn't bad but in fact the correct way of working with 2 domains. If possible with good sources I can point out to him since he don't wants to hear anything about this. If someone also has a few words about the keywords and the canonical-tag I would really appreciate it! Thank you very much!

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• How do I clip an image in OpenGL ES on Android?

  - by Maxim Shoustin

  My game involves "wiping off" an image by touch: After moving a finger over it, it looks like this: At the moment, I'm implementing it with Canvas, like this: 9Paint pTouch; 9int X = 100; 9int Y = 100; 9Bitmap overlay; 9Canvas c2; 9Rect dest; pTouch = new Paint(Paint.ANTI_ALIAS_FLAG); pTouch.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT)); pTouch.setColor(Color.TRANSPARENT); pTouch.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL)); overlay = BitmapFactory.decodeResource(getResources(),R.drawable.wraith_spell).copy(Config.ARGB_8888, true); c2 = new Canvas(overlay); dest = new Rect(0, 0, getWidth(), getHeight()); Paint paint = new Paint();9 paint.setFilterBitmap(true); ... @Override protected void onDraw(Canvas canvas) { ... c2.drawCircle(X, Y, 80, pTouch); canvas.drawBitmap(overlay, 0, 0, null); ... } @Override 9public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: { X = (int) event.getX(); Y = (int) event.getY();9 invalidate(); c2.drawCircle(X, Y, 80, pTouch);9 break; } } return true; ... What I'm essentially doing is drawing transparency onto the canvas, over the red ball image. Canvas and Bitmap feel old... Surely there is a way to do something similar with OpenGL ES. What is it called? How do I use it? [EDIT] I found that if I draw an image and above new image with alpha 0, it goes to be transparent, maybe that direction? Something like: gl.glColor4f(0.0f, 0.0f, 0.0f, 0.01f);

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• Dualboot Asus n56v (ubuntu / win 7 x64) - ubuntu doesn't detect partition table made by windows

  - by user76439

  I have an Asus n56v and I've got troubles installing Ubuntu 12.04 x64. I already have installed Windows 7 x64! The hard drive is: Hitachi HTS547575A9E384 My problem: The installation program doesn't recognize the already existing partitions and is offering only options where there are partitions. Can someone help me out? Is this an ACPI/IDE conflict, missing driver or conflict with Windows 7? (I'm not an expert on Linux, only working sometimes with it.) I now tried out some options concerning EFI with a GTP-table. Everything worked but I wasn't able to fix a dual boot (Windows boot loader) nor with GRUB2. The laptop is still having a BIOS, but is able to boot DVDs/CDs in EFI-mode. Now I try to avoid EFI and GTP using the old windows MBR style. I reinstalled Windows, so far no problem. When I want to try to install Ubuntu, it doesn't detect the already existing partition table. It is just showing me an empty space for the whole disk. Other threads like Ubuntu 12.04 does not see windows already install on my computer (dual installation) don't help me out. os-prober shows me a correct result. I don't know how to deal with gdisk as shown in Installer doesn't detect existing partition table/windows 7 partition. I have 750GB for the whole disk. I'm using: 90GB for Windows reserved partition + system partition, 500GB for data and the rest should be for SWAP and linux-system. How can I make Ubuntu detect the partition table?

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• I just started a job with Scrum and something seems to be missing. I am new to Scrum

  - by punkouter

  The code is a complete mess of a combination of classic ASP/ASP.NET. The scrum consist of us patching up the big mess or making additions to it. We are all too busy doing that to start a rewrite so I am wondering.. Where is the part in Scrum where the developers can have the power to say that enough is enough and demand that they are given time to start the big rewrite? We seem in an endless loop of just patching old code with 'Stories'. So things are being run by the non-technical people who seem to have no desire to push for a rewrite because they don't understand how bad the codebase has gotten.. So who is in charge of making this big rewrite change happen? The developers? The Scrum Master? The current strategy is just to find time and do it ourselves without the higher-ups involved since they are mostly to blame for the current mess we are in.. <- insert rant about non-technical people telling technical people what to do here ->.

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• PhysX Capsule Character Controller floating above ground

  - by Jannie

  I am using PhysX Version 3.0.2 in the simulation package I'm working on, and I've encountered some bizarre behavior with the capsule character controller. When I set the controller's height and radius to the appropriate values (r = 0.25, h = 1.86)it behaves correctly (moving along the ground, colliding with other objects, and so on) except that the capsule itself is floating above the ground. The actor will then bump his head when trying to get through a door, since the capsule is the correct height but also floating above the ground. This image should illustrate what I'm going on about: One can clearly see that the rest of the scene has their collision bodies wrapped correctly, it's just the capsule that's going wrong! The stop-gap I've implemented is creating a smaller capsule and giving it an offset, but I need to implement ray-picking for the controller next so the capsule has to surround the character model properly. Here's my character creation code (with height = 1.86f and radius = 0.25f): NxController* D3DPhysXManager::CreateCharacterController( std::string l_stdsControllerName, float l_fHeight, float l_fRadius, D3DXVECTOR3 l_v3Position ) { NxCapsuleControllerDesc l_CapsuleControllerDescription; l_CapsuleControllerDescription.height = l_fHeight; l_CapsuleControllerDescription.radius = l_fRadius; l_CapsuleControllerDescription.position.set( l_v3Position.x, l_v3Position.y, l_v3Position.z ); l_CapsuleControllerDescription.callback = &this->m_ControllerHitReport; NxController* l_pController = this->m_pControllerManager->createController( this->m_pScene, l_CapsuleControllerDescription ); this->m_pControllerMap.insert( l_ControllerValuePair( l_stdsControllerName, l_pController ) ); return l_pController; } Any help at all would be appreciated, I just can't figure this one out! P.S. I've found a couple of (rather old) threads describing the same issue, but it seems they couldn't find a solution either. Here are the links: http://forum-archive.developer.nvidia.com/index.php?showtopic=6409 http://forum-archive.developer.nvidia.com/index.php?showtopic=3272 http://www.ogre3d.org/addonforums/viewtopic.php?f=8&t=23003

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• Ubunto 12.10 Boots to purple screen

  - by Ric

  I know this question has been tackled in a couple different threads but I've tried what I could from those and have not resolved the issue. I have just a basic understanding of this system so feel free to talk down to me or explain this like you would to a 5 year old. Let's start from the beginning. My son has a computer built by an IT friend of mine (we moved so he can't help any more). It had Windows XP running on it and it just stopped working correctly. This same friend had built a laptop for me with Ubuntu which I liked so I thought I'd put a new OS on my sons computer and it may work better. I downloaded Ubuntu 12.10 onto a USB drive and loaded it onto his computer. I followed all the prompts, it installed, I restarted the computer, it gives me the option of which OS to pick. I pick Ubuntu and it seemingly loads. The desktop comes up with just the basic pinkish Ubuntu background but that is it. There are no icons. I can't right click anywhere to create a file. Left clicking the mouse does not create a square when moved. Alt + F2 doesn't do anything. I can open a terminal but any of the commands I have seen in previous threads do not correct any issues. What else can I do, or what resources are available to fix this problem? I don't know if there are additional files on the USB drive that I need to access or what. Also, one of the problems we were having with my sons computer is that windows would only load to a blank screen. It runs accordingly in safemode and my install of Ubuntu was through safemode of Windows XP.

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• How to get "Fn" keys to work (Asus 4830T)? (specificly, the "suspend" key)

  - by Pointy

  I've got an Asus 4830T onto which I've just re-installed 12.04 because I installed an SSD. I was running 12.04 before too, which had been upgraded over a few releases. At some point on that old install, I had gotten all the "Fn" keys to work, or at least all the ones I cared about. (Oh except I think the screen brightness keys never worked.) I have no recollection of what I did. Anyway now things are fine, and some of the Fn keys work: the one to turn of the trackpad and the one to turn off wireless (grr I hate that one). However, the "suspend" key for some reason does not work. Now the system will suspend and resume just fine, but I'm having to do it from the menu. Is there an easy (or hard) way to make those work? I'm running straight Ubuntu but with Xfce installed as my normal desktop. (In other words, it's not Xubuntu, though I doubt it matters.) I recall at some point having found some arcane mapping mechanism to bind the Fn keys to actions, but I can't find it now. (I'm perfectly OK with editing weird files; I'm a long-time Unix user.) (Very long-time.)

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• Access a PLESK website before propagation?

  - by RCNeil

  My web host uses Plesk and I want to know if there is anyway to access and view a website (with PHP and other processes being functional) without propagation of the domain name? I have found countless forums on this but they are all pretty old (circa 01-04) and involve either tricking your localhost or SSH commands and some even result in terrible security risks. I would like to access a web page directory through a browser and see it's contents while having the PHP processes carry out... before I propagate it's potential domain name. People claim this is pointless but during a site migration why on earth would you not test a site before propagating it? I'm looking for something similar to what cPanel offers i.e. http://IP.ADDRESS./~mydomain.com The only solution I could think of is storing the site in a new directory of an already functional site and then setting up databases and testing the site once it's complete. Once tested and working I should be easily be able to migrate the files to the "new" domain name's root directory and just setup a new databases and then propagate the domain name. I can't believe that Plesk V10+ still does not have a site preview method that includes PHP, JS, and Flash ability.

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• Why can't I compile this version of Postfix?

  - by Coofucoo

  I just installed postfix 2.7.11 in Ubuntu server from source code. I do not use the ubuntu own one because I need the old version. I found a very interesting problem. Before, in both CentOS 5 and 6, I can build the source code without any problem. But, in Ubuntu server 12.04 is totally different. I got the following problems: dict_nis.c:173: error: undefined reference to 'yp_match' dict_nis.c:187: error: undefined reference to 'yp_match' dns_lookup.c:347: error: undefined reference to '__dn_expand' dns_lookup.c:218: error: undefined reference to '__res_search' dns_lookup.c:287: error: undefined reference to '__dn_expand' dns_lookup.c:498: error: undefined reference to '__dn_expand' dns_lookup.c:383: error: undefined reference to '__dn_expand' Yes, this reason is obviously. I just search related library and add it to the makefile. It works. The question is why? What is the difference between Ubuntu Server and CentOS? One possibility is gcc and ld version. Ubuntu server use different version of gcc and ld with CentOS. But I am not sure.

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• How do I uninstall GRUB?

  - by ændrük

  A hard drive that I use only for data storage still has GRUB from past Ubuntu installations. How can I remove GRUB from it without harming the rest of the drive's data? Background I occasionally move the data drive between computers with various boot order configurations, so I would like it to be non-bootable in order to avoid having to accommodate it in each computer's BIOS settings. When I power on a computer while only the data drive is attached, the following appears: error: no such device: fdf38dd4-9e9d-479d-b830-2a6989958503. grub rescue> I can confirm from old backups of /etc/fstab that this was the UUID of a root partition that I recently reformatted and which no longer exists. Here's the the data drive's partition table and raw master boot record. Please note that I'm not interested in workarounds that don't answer my primary question. I can think of several ways to work around this issue, but it bothers me on principle that I don't know how to directly resolve it. Every installation procedure should have a counterpart uninstallation procedure.

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• Google is re-indexing pages after redirecting URLs from HTTP to HTTPS incorrectly

  - by SLIM

  I upgraded my site so that all pages have gone from using HTTP to HTTPS. I didn't consider that Google treats HTTPS pages differently than HTTP. I recreated my sitemap to so that all links now reflect the new HTTPS URLs and let it be for a few days. (Whoops!) Google is now re-indexing all the HTTPS pages. I have about 19k pages on the site, and Google has already indexed about 8k of the new HTTPS pages. The problem is that Google sees all of these as brand new pages when many of them have a long HTTP history. Of course most of you will recognize the problem, I didn't set up a 301 from the old HTTP to the new HTTPS URLs. Is it too late to do this? Should I switch my sitemap back to HTTP URLs and then 301 redirect to the new HTTPS URls? Or should I leave the sitemap as is, and setup 301 redirects anyway... I'm not even sure if Google is trying to reach the HTTP site anymore. Currently the site is doing 303 redirects (from HTTP to HTTPS), although I haven't figured out why yet.

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• Getting file system free space

  - by Fred Riley

  This isn't a problem as such, more a request for information based on ignorance of the Linux filesystem. The very short question is: How do I find out how much free and used space there is on the volume from which Ubuntu is running? More detail: I'm running Ubuntu 12.04 from a 64Gb USB3 stick, created from booting up a year-old Ubuntu 12.04 DVD and running Startup Disk Creator. The reason for this is that the Master Boot Record on my hard disk, holding Windoze 7, has gone belly-up, and whilst awaiting a recovery disk I'm running Ubunto off USB or DVD as a 'trial'. (And will continue to run Ubuntu after restoring Windoze, as I've rediscovered my love of the penguin :o)) After installing Ubuntu on the stick I ran the software update app, which downloaded some 450Mb of updates and took a couple of hours to install to the stick. A couple of times I got a message saying that disk space was short. So I looked in the file manager (or whatever it's called these days) and couldn't see the stick listed, just: SYSTEM hard disk (listed as 479Gb Filesystem) two other partitions that had been created by Windoze "4.3GB Filesystem" which when I try to open gives the error "Could not find /cow", and when I try to unmount it tells me I can't because it's not mounted - D'OH!! Edit: screenshot of file manager Edit: screenshot of low disk space warning What I can't see is the USB stick from which I'm running Ubuntu. Where's it gone, anybody know? This is tangentially related to a previous question of mine about system tools, in that I'm trying to get control and knowledge of the system in the newest incarnation of Ubuntu.

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• Are there design patterns or generalised approaches for particle simulations?

  - by romeovs

  I'm working on a project (for college) in C++. The goal is to write a program that can more or less simulate a beam of particles flying trough the LHC synchrotron. Not wanting to rush into things, me and my team are thinking about how to implement this and I was wondering if there are general design patterns that are used to solve this kind of problem. The general approach we came up with so far is the following: there is a World that holds all objects you can add objects to this world such as Particle, Dipole and Quadrupole time is cut up into discrete steps, and at each point in time, for each Particle the magnetic and electric forces that each object in the World generates are calculated and summed up (luckily electro-magnetism is linear). each Particle moves accordingly (using a simple estimation approach to solve the differential movement equations) save the Particle positions repeat This seems a good approach but, for instance, it is hard to take into account symmetries that might be present (such as the magnetic field of each Quadrupole) and is this thus suboptimal. To take into account such symmetries as that of the Quadrupole field, it would be much easier to (also) make space discrete and somehow store form of the Quadrupole field somewhere. (Since 2532 or so Quadrupoles are stored this should lead to a massive gain of performance, not having to recalculate each Quadrupole field) So, are there any design patterns? Is the World-approach feasible or is it old-fashioned, bad programming? What about symmetry, how is that generally taken into acount?

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• Broadcom Wireless Issues in Lubuntu 14.04

  - by ratxinxaxcage67

  I recently installed Lubuntu 14.04 on my parents' old laptop, and I've been having a super difficult time getting the Broadcom card up and running. I've been following this thread: Installing Broadcom Wireless Drivers ...but I'm still stuck. lspci -vnn | grep Network showed: 06:05.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 02) iwconfig showed: lo no wireless extensions. eth0 no wireless extensions. I've installed b43-firmware-installer and b43-fwcutter and also the linux-firmware-nonfree package. At boot, I keep getting a b43-phy0 error, so I tried sudo rmmod b43, and I got: rmmod: ERROR: Module b43 is not currently loaded I also tried: dmesg | grep b43 [ 17.318405] b43legacy-phy0: Broadcom 4306 WLAN found (core revision 4) [ 17.384870] b43legacy-phy0: Loading firmware b43legacy/ucode4.fw [ 18.046777] b43legacy ssb0:0: Direct firmware load failed with error -2 [ 18.046785] b43legacy ssb0:0: Falling back to user helper [ 18.047858] b43legacy-phy0 ERROR: Firmware file "b43legacy/ucode4.fw" not found or load failed. [ 18.047965] b43legacy-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware (version 3). I went to url it told me to, but it didn't tell me to do anything I haven't already tried. Any help and/or suggestions would be greatly appreciated!

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