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• What makes an application memory bandwidth bound?

  - by TheLQ

  This has been something that's been bothering me for a while: What makes an application memory bandwidth bound? For example, take this monstrosity of a computer that calculated the 5 trillionth digit of pi (and later 10 trillionth digit). I was surprised that they choose the lower but faster 98 GB RAM at 1066 MHz instead of the larger but slower 144 GB at 800 MHz. This is especially surprising considering they are using 22 TB HD array to store the results from computation; more RAM means less need for hard drives. Maybe its because I don't write applications for HPC servers, but how would RAM be the bottleneck? Are there any other non-HPC applications that usually run into this problem?

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• I can't even login, black screen! [SOLVED]

  - by Elisa Velasco Lorenzo

  I wanted to fix something, and I followed the advice given by someone on the #ubuntu IRC chat. I don't think I did it properly, because now, I cannot even login and I have a black screen. Ii must be a Gdm / Lightdm issue... I am writing this from another computer. Is there a way I can solve this without formatting and losing all my files? All I have is the GRUB menu. I don't even have the recovery mode on the GRUB menu...

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• About partition sizes

  - by Lassi

  I am going to install Ubuntu on a new computer, but I'm not quite sure how big each partition should be. If I create only root, home and swap partitions, on what partition will programs be installed? Will they go to /home or to root? Basically does it make sense for instance to have following partitions: / - 6GB /home - 80GB /swap - 4GB Is 6GB large enough for my root partition? Also are these 3 partitions a good choice, or is there a better configuration? I have at the moment 3 operating systems installed, and I do make changes quite often.

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• udev rule gives wrong group ownership

  - by Tirithen

  I have added a udev rule for my Arduino, but the symlink gets the ownership "root root" instead of "root dialout". $ cat /etc/udev/rules.d/47-Arduino.rules SUBSYSTEM=="usb", ATTR{idVendor}=="2341", ATTR{idProduct}=="0001", MODE="0666", SYMLINK+="arduino", GROUP="dialout" $ ls -la /dev/ar* lrwxrwxrwx 1 root root 15 sep 8 11:02 /dev/arduino -> bus/usb/003/007 $ ls -la /dev/bus/usb/003/007 crw-rw-r-- 1 root dialout 189, 262 sep 8 11:12 /dev/bus/usb/003/007 My user is a member of the group "dialout" but I still get "Permission Denied" error when I'm trying to communicate with the device. There are also no problems when I'm using the "default" device "/etc/ttyACM3". $ ls -la /dev/ttyACM3 crw-rw---- 1 root dialout 166, 3 sep 8 11:12 /dev/ttyACM3 I have tried to restart both the udev service and reboot my computer. How can I fix this?

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• Ubuntu 10.10 crashing on initialization, how to solve?

  - by Tom Brito

  Yesterday I installed Ubuntu 10.10, and on the first login it got frozen, so I powered off and on the computer, and it started well. Now, during the updates it got frozen again, and after every login again. I can't even change to the command line with ctrl+f1 or f2. Is there a way to get some log information on the initialization? I have no idea what can be causing this. Previously I was using Ubuntu 9.04, which is now not receiving new updates. Versions 10.04 and 9.10 behavior the same as 10.10, and version 11.04 crashes much on many situations. So, is there a way to get some log information on the initialization to help find what's wrong?

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• Where is the Accessibility mouse click lock?

  - by user10133

  I've been a user of Linux on the desktop off and on again over the years. I very nearly switched my primary computer to Ubuntu prior to the release of Windows 7. There were a few, but significant issues at the time that prevented wholesale adoption, mostly tethering with my phone and lousy VPN Client. One key component I could count on was the Accessibility features. I have recently installed Ubuntu 10.10 and am considering giving it another try, but it appears Ubuntu has taken a leap backwards in that it no longer has a click lock feature for the mouse. Basically I need the ability to press and hold the left button to trigger a locking of the button so I can move the mouse by way of a trackpoint with my prosthesis. I absolutely require this feature and it is a deal breaker if it won't work. I've tried the Dwell keys but this is a chaotic control at best. I've never been able to manage a drag of any kind.

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• Is there a name for this issue?

  - by Epicmaster

  I was just talking to my partner about how hard it is to personally judge how good your product is after a while because you use it so often. You literally spend hours on your computer doing nothing but work on this Consumer Facing application, and you start to feel a little fatigue of using it over and over and over, at least a hundred times a day. You get scared this fatigue may mean the product you are building may have the same effect on the users and might mean you are doing something wrong. All i'm asking is, is there a name for this in product development? For the fact that as a designer+ programmer+everything else, your product might not suck as much as you think simply because you spend way to much time with it, or a variation of this?

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• Alexa indexing browsing history?

  - by Haluk

  We have this test.php sitting around in a forgotten folder. It is a script which just sends an email to our site admin. We never had a page linking to it. It is not indexed by Google. It does not exist in the Internet Archive Wayback Machine. But every now and then it gets crawled by ia_archiver. I wonder how it got indexed. Could it be because of the Alexa toolbar installed on our computer? Does Alexa index our personal browsing history?

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• Can I run Ubuntu Live from a USB flash-drive without destroying the data on it?

  - by Lucian

  I already have a number of files on a flash drive (8 gb) that I would prefer to keep, but I would like to try Ubuntu even if merely for the aesthetics. I use Windows XP. I know that it's definitely possible to run Ubuntu from a bootable drive like my flash drive to try Ubuntu but I would much rather keep my files intact not only on my flash drive but also my hard drive, if that's possible. I also want to know if it's entirely possible that while running Ubuntu from the USB if I can switch back to Windows while my computer is still on. If I'm missing something, please let me know. I'm very grateful for any assistance in this matter.

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• Just installed 12.04 and it freezes when I try logging in

  - by James

  I just installed Ubuntu 12.04 alongside Windows 7 on an Acer Aspire 1 with AMD Dual-Core C60, 4 GB RAM, and 320 GB HDD (100 GB partitioned for Ubuntu). After restarted my computer, I was able to log in fine but when I tried to log in again after shutting my netbook off, it began to freeze on the log in screen. The freezing occurs several seconds after I'm prompted to enter my password. Even if i enter the password before the freezing occurs, I end up getting stuck while it's loading or something. I'm new to Ubuntu so I have no idea what to do. Also, before it gets to the log in screen, it says something like this: NTFS5: No wubildr NTFS5: No wubildr NTFS5: error: "prefix" edit: it was wubildr, not unbilder. Also, the freezing seems to be inconsistent

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• Finding Internship Opportunities

  - by mbreedlove

  I am a senior in high school majoring in Computer Science next fall. This summer, I would like to intern at a company relevant to my interests of investment banking and software engineering. What would be some possible ways to find openings? How should I contact them? (E-mail, phone, etc.) Should I prepare and submit a CV? I feel it might be a little dull as it would have no experience or references. After contacting someone about an internship, should I follow up, or just wait for them to contact me? Is there anything else I should do or be aware of?

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• How do I keep the Thunderbird profile in sync between multiple computers?

  - by David Planella

  I'd like to find a definitive solution to automatically keep my Thunderbird profile in sync between my laptop and my desktop computer. I'm using IMAP, so keeping the e-mail itself in sync is not an issue I can use Ubuntu One for the contacts, so that should not be an issue, either. However, there are a bunch of other files and folders in the Thunderbird profile, and I'm not sure which ones I should keep in sync and which ones I shouldn't bother about. Ideally, I'd like to use Ubuntu One to mark the required ones for syncing, but I would appreciate any help in deciding which ones exactly need to be synced.

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• Windows Repairs Itself After Ubuntu Boot

  - by pjtatlow

  I have a custom built computer in my home which was running Windows 7 primarily. After I installed Ubuntu 12.04 and upgraded to 12.10, Windows 7 has to perform startup repair after every Ubuntu boot up. For example, I am using Ubuntu for my everyday work, but when I switch to Windows to play one of my steam games, windows fails to boot, and it switches to the recovery partition to "repair windows" then boots windows. The whole process takes about 20 minutes, which is quite annoying. Anyone know why this is happening or what I can do? Thanks in advance!

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• Why do I get "No root file system is defined" when I try install in one partition?

  - by Emilio

  The thing is that I have 3 partitions on my computer. /dev/sda1 Type: ntfs (size 104MB; 35MB in use) [This is Windows Loader] /dev/sda2 Type: ntfs (size 144598MB; 64536MB in use) [Here I want to install UBUNTU] /dev/sda3 Type: ntfs (size 105353MB; 20227MB in use) [This my backup partition I don't wan't to delete anything from here, I have all my necessary information] So the problem is when I select "Device for boot loader installation" "/dev/sda2" Pops out: "No root file system is defined. Please correct this from the partitioning menu." How can I resolve this? :)

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• Is wikipedia a valuable resource for studying data structures? (can we call it complete?)

  - by Amir Nasr

  Can I depend on wikipedia to learn data structures fully using the list of data structures http://en.wikipedia.org/wiki/List_of_data_structures and the links they refer to? The same question for algorithms http://en.wikipedia.org/wiki/List_of_algorithm_general_topics ?... What's after learning algorithms and data structures? Specializing in a certain field of algorithms such as computer graohics, memory management...etc? or what could be the plan for mastering programming after knowing the language syntax and the background about program design and programming logic? I asked about wikipedia because i would like to find a complete resource or are least a resource which would be enough for the field of data structures instead of searching for separate articles in different places in other words an alternative to books which may even be more complete.

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• How do you install less css command line compiler?

  - by chrisjlee

  From my understanding and correct me if I'm wrong, I have to get ruby or NPM installed to get the less css compiler working. I don't have any ruby installed and I'm not really sure how to get my computer to that point. I also want to minimize my footprint; installing the minimal amount of ruby libraries if possible (because i will never use ruby except for when i run less). What are the steps involved in getting less working and running? Before you down vote, I know there was this previous thread (Less CCS compiler install). This particular person already has some other packages installed. I'm trying to figure out all the packages needed to get to that point. Or if someone could point me to the right documentation I would be thrilled!

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• How to create a bootable USB stick?

  - by Deborah Shadovitz

  I am looking at this: http://www.ubuntu.com/download/help/create-a-usb-stick-on-ubuntu I need to create a boot disk to test Ubuntu to make sure it will run on a PC (Compaq Mini CQ10-120LA) I was given. I can create the boot disk off of a Mac (in English) or Windows (but Windows is in Spanish and foreign to me). Questions: What format do I choose for the USB stick? (I wish the instructions stated this). What is Dash? (Will I know when I run the installer?) Can I do this from a Mac or Windows computer? Or only from Ubuntu?

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• Problem Trying to Install ROOT (by CERN) on Ubuntu 11.04 i386

  - by Jose Luis

  I hope you can help me with this problem I am trying to install root in my computer, but I have a problem and I don't know what to do to solve it I've downloaded the tar file with the root version that I want to install I've extracted the files in the tar file I've run the configure program succesfully, but when I run "make" command I get this result: cp /root/root/core/utils/src/RClStl.cxx core/utils/src/RClStl_tmp.cxx bin/rmkdepend -R -fcore/utils/src/RClStl_tmp.d -Y -w 1000 -- -pipe -m32 -Wall -W -Woverloaded-virtual -fPIC -Iinclude -DR__HAVE_CONFIG -pthread -UR__HAVE_CONFIG -DROOTBUILD -I/root/root/core/utils/src -D__cplusplus -- core/utils/src/RClStl_tmp.cxx g++ -O2 -pipe -m32 -Wall -W -Woverloaded-virtual -fPIC -Iinclude -DR__HAVE_CONFIG -pthread -UR__HAVE_CONFIG -DROOTBUILD -I/root/root/core/utils/src -o core/utils/src/RClStl_tmp.o -c core/utils/src/RClStl_tmp.cxx In file included from core/utils/src/RClStl.h:28:0, from core/utils/src/RClStl_tmp.cxx:16: core/utils/src/Scanner.h:16:27: fatal error: clang/AST/AST.h: No existe el fichero o el directorio compilation terminated. make: * [core/utils/src/RClStl_tmp.o] Error 1 rm core/utils/src/RClStl_tmp.cxx I don´t know what to do Please, help me thank you in advance

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• Why do different browsers return different search results at Google and how can I prevent it?

  - by Sei

  I am running some websites and am constantly checking keywords' rankings on google.com. And it is really important for us to see the organic search result without logging in or setting a specific location. Since this morning my colleague and I have checked the same ranking on both IE and firefox, the result surprisingly is very different (it almost feel like IE was logged in because the ranking is much higher, while in reality it is not). I have changed computer and the same problem occurred. It did not happen before. Can anyone tell me why is it?

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• Move the home directory back to single partition

  - by Nathan J. Brauer

  I've seen a ton of tutorials on how to move your home directory to a separate partition. I want to do the opposite. I have two HDDs. One /home/ and the other is everything else (both drives have only one partition). I'm selling the computer but want to keep one of the hard drives. So, I'd like to move the home directory and system files back onto a single drive. Which ever way is quickest/easiest (separate partitions or all on one partition). Thank you!

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• Learning the basics

  - by Kevin

  I am a Linux server administrator first and foremost... Having said that, I have been asked by a former high school teacher of mine to teach students a bit about programming. Like any Linux administrator, I know my fair share of Python and Bash. The problem is that I know NOTHING about the lower level stuff like "machine code" and compilation. The main purpose of this series is to teach programming, not computer science, so I don't need a graduate degree's level of knowledge for this, they will be learning Python first and foremost. However, I would like to learn enough to at least broach the subject with them, any ideas where I can learn that kind of stuff relatively quickly?

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• What is the best tool to sync browser passwords and bookmarks?

  - by jgbelacqua

  Sadly, everything I've tried so far has been painful to manage between two computers, (even between different browsers on the same computer). So, right now I have different aggregations of bookmarks passwords in xmarks, delicious, google bookmarks, firefox sync, text files, and in figaro password manager (fpm2). I've also tried to use bindwood in the past. What I would like to do is merge all bookmarks and passwords into some solution that actually works either with tools available under Ubuntu, or with a browser-based tool (addon/plugin/extension) which works between between google-chrome/chromium, and firefox. It would be ideal if there was an ability to send and store passwords encrypted (if not on my own server). Whatever the method, I need the ability to have import from existing sources. (It doesn't have to be pretty, just repeatable.) It's possible that some things I've ruled out are now workable (e.g., xmarks broke for me at one point because I hit their bookmark limit for the server/account, and bindwood, firefox sync were firefox only).

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• grub rescue error, [on hold]

  - by Lucas Smith

  I was trying to install a Linux OS to an partition alongside Windows 8 and Ubuntu, but I got confused and I just canceled the installation. Then I booted into Windows 8 and deleted the 20GB partition that I created. When I restarted the computer I got stuck at the following error message: error: no such partition grub rescue> I don't know what to do. I do not want to lose any data. Please help! Sorry for not selecting any answers, I overrited Linux with Windows XP and then repaired the Master Boot Record for Windows 8 and deleted XP, I'm now staying at Windows 8.

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• Keyboard and touchpad do not work

  - by user289219

  I have an Lenovo IdeaPad S210 Touch and I want to install Ubuntu on it. The problem is that when I try booting the system from a USB drive (starting the so-called Live session) to try to see if the system works on my computer, the system will turn on and everything will work properly except for the keyboard and the touchpad. Neither of them are listed when using this command: xinput --list. I cannot get my laptop keyboard/touchpad to work, but USB keyboards and mice will work and my laptop's touchscreen will also work.

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• power manger keeps on shuting down the display even when i state in the power manger to never do that.

  - by david25

  i'm probably missing something here, i'm using the default ubuntu power manger, i setup it like that: on AC: no screen dimming when ideal. never put computer to sleep. never put display to sleep. on battery i kept the default setting. and still ubuntu does what ever it likes :\ , after 15 min it puts the display to sleep. any one having the same problem and found a way to bypass it? im using eee pc with ubuntu 10.10 desktop.

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