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• Update problems due to "installation of packages from not authenticated sources" error

  - by Denis Hoss

  I have some problems updating my Ubuntu Requires installation of untrusted packages The action would require the installation of packages from not authenticated sources. cinnamon gir1.2-muffin-3.0 libgnome-keyring-common libgnome-keyring0 libmuffin0 muffin-common The downloads are from the Main server, the Source code under Ubuntu Software tab is marked Is there something I have missed? The output of sudo apt-get update is: W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6A9653F936FD5529 W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A777609328949509 W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ oneiric/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_oneiric_partner_binary-i386_Packages)

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• Using .add() on the same widget more than once

  - by Dillon Gilmore

  I asked this question on Reddit and was directed here. http://www.reddit.com/r/Ubuntu/comments/vhadl/quickly_dynamic_ui/ Unfortunately I am having the same issue and the problems seems that you can only use .add() on a widget once. So here is my code, self.ui.labels = [] for titles in entries: label = Gtk.Label() self.ui.labels.append(label) self.ui.viewport1.add(self.ui.labels[-1]) self.ui.paned1.show_all() Now, for fun I decided "What would happen if I just manually did..." self.ui.viewport1.add(Gtk.Label()) self.ui.viewport1.add(Gtk.Button()) self.ui.viewport1.add(Gtk.Entry()) For my first code snippet I get this error, Gtk-CRITICAL **: gtk_viewport_add: assertion gtk_bin_get_child (bin) == NULL' failed The error happens an unknown amount of times because the list entries can vary in length, but for my second code snippet it happens exactly twice. This means that when I viewport1.add() it works the first time, but all adds after that receive the error above. So my question, is there a way in python to use .add() on the same widget more than once?

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• How to remove shells?

  - by MyNameIs...

  I installed few shells that I wanted to try out on Ubuntu 12.04, but none of them worked at all. It could be that I installed them all at the same time, meaning the OS didn't get a chance to work everything out, but either way, they didn't work. I would now like to remove them. The one's that I installed are Fluxbox, OpenBox, XFCE, and MATE. I installed them through the help of this site. Everything seemed to have been working properly until I actually tried to use the shells and nothing loaded at all. Except for Fluxbox, I think that one worked. I want to know of any way to repair or perhaps just remove the packages entirely. I might have already removed them because I did the apt-get remove command on all of them, but they were still in the list on the login screen.

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• Why does update-grub not find ubuntu 11.10?

  - by Klaynos

  I've recently installed ubuntu onto my laptop. With the intention of dual booting with windows 7. On installation Grub wasn't loading, the computer continued to boot straight into windows. I loaded a live cd, mounted the installed ubuntu partion (sda6) as /mnt/ and windows boot partition as /mnt/boot Following the second option here: http://ubuntuguide.net/how-to-restore-grub-2-after-reinstalling-windows-xpvistawin7 Through its entirety, so creating a new grub.cfg file. chroot /mnt update-grub Did not find ubuntu, just windows 7 and the windows recovery partition. Thinking this might be a weird quirk that as I was in ubuntu (all be it a live cd) it might not list ubuntu I restarted. Grub loaded but ubuntu was nowhere to be seen. How can I add ubuntu with Grub2? I could have fixed this myself in old grub but I'm pretty much in the dark here. Thanks

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• Open World Day 4

  - by Antony Reynolds

  A Day in the Life of an OpenWorld Attendee Part V Last day at OpenWorld.  The exhibits are closed, and the final few presentations are being given.  I spent much of the day meeting with customers to talk about SOA/OSB and Coherence.  Main event of the day was the farewell party which was loud and surprisingly well attended.  I was able to have lunch with Dave Felcey, Coherence PM, who has a great blog and is always ready to share his expertise with people. So that was OpenWOrld for another year.  I met a friend of a friend who attends OpenWorld every year and attends the Demo Grounds with a list of questions to ask people.  I think that illustrates the point that everyone approaches OpenWorld in a different way and looks to get different things from it.  For me OpenWorld is a great experience to feel the energy in Oracle and network with customers and partners.  Hope to see you there next year!

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• Gnome extensions don't work! I've tried everything!

  - by Nightshaxx

  When I go to https://extensions.gnome.org/, and try to install an extension, it clicks on, but nothing happens to my shell. Then, when I reload the page, the slider has turned off. Here are the things I have tried: I tried Chrome, Firefox, and Opera adding http://extensions.gnome.org to my allow plugin list in google chrome and made sure gnome-intigration is enabled I made a new firefox profile and tried installing it I reset my gnome shell settings (How do I reset GNOME to the defaults?) - this link actually broke my system, as now I can't log in to any desktop environment, the only way I can get to Unity, is by logging in to another desktop environment like cinnimon (which doesn't work) , then immediately logging into unity. Whenever I try to just log into unity or pretty much any other desktop environment, it logs in, but then seems to crash, and log out. Sometimes I even get quick glances of the Unity bar before it crashes I tried-re installing gnome None of these methods worked!! Thank you in advance!!

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• What parameters to use to compare GUI frameworks / toolkits?

  - by gooli

  I'm doing some research on the best GUI toolkit to use for future products at the company. We're talking about a fairly large organizations with quite a bit of code and a complete rewrite project in planning. Don't ask. Anyway, I'm trying to create a list relevant parameters to judge the toolkits. What would you use to drive the comparison? Here's what I've got so far: Maturity Ease of development Ease of prototyping Ease of maintenance Size of hiring pool Available knowledge at the company Training costs Community size Community level of expertise (how hard to find good answers to complex problems) Amount of expert-level books available Ability to interface to other technologies Deployment considerations Visual aesthetics Ability to access OS resources Multiple monitor support (something that might come in handy in our particular application)

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• Is it save to configure "Shutdown" on "When laptop lid is closed" ?

  - by Takkat

  To setup a laptop owned by a complete PC novice any settings that may become hard to tackle remotely need to be avoided. The laptop will be administrated via SSH. One thing in my list are problems arising from improper wake-ups from suspend or hibernate as they may also affect network accessibility. This is why I thought setting up power management to "shutdown" on closing the laptop lid could be a good idea. However I am not sure if this is a safe way to do. What problems in addition to software not closing properly (and thus not saving their data) could I be faced if I proceeded as planned?

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• What are some good, simple examples for queues?

  - by Michael Ekstrand

  I'm teaching CS2 (Java and data structures), and am having some difficulty coming up with good examples to use when teaching queues. The two major applications I use them for are multithreaded message passing (but MT programming is out of scope for the course), and BFS-style algorithms (and I won't be covering graphs until later in the term). I also want to avoid contrived examples. Most things that I think of, if I were actually going to solve them in a single-threaded fashion I would just use a list rather than a queue. I tend to only use queues when processing and discovery are interleaved (e.g. search), or in other special cases like length-limited buffers (e.g. maintaining last N items). To the extent practical, I am trying to teach my students good ways to actually do things in real programs, not just toys to show off a feature. Any suggestions of good, simple algorithms or applications of queues that I can use as examples but that require a minimum of other prior knowledge?

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• How to return older Thunderbird version?

  - by Holger

  today at startup my Tb (not precisely sure what version it was) asked if it should check compatibility of the lightning calendar addon. That is to say it displayed in a list windows the only item: lightning and said it was not compatible. Choices were "check" or "don't" check compatibility. I clicked on check and after nothing happened for several minutes on "cancel". So, now my Tb is upgraded to 15.0 and Lightning isn't there anymore. It never asked me to upgrade anyway and I urgently need my calendar now. Any suggestions warmly welcome! Holger

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• Cannot get Atheros AR9285 to work on 12.10

  - by user100449

  I've already went through all possible advices and still cannot start my Atheros AR9285 wireless card. I have a laptop Toshiba Portege Z830 where the WiFi already worked under Windows 7. But after migration on Ubuntu 12.10. I'm not able get it work. This is what I see on command lshw *-network UNCLAIMED description: Network controller product: AR9285 Wireless Network Adapter (PCI-Express) vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:02:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:c0500000-c050ffff This is what I see on command rfkill list 0: Toshiba Bluetooth: Bluetooth Soft blocked: yes Hard blocked: no 1: hci0: Bluetooth Soft blocked: yes Hard blocked: no Any idea?

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• Read an object from compressed file generated from ActionScript 3

  - by Last Chance

  I have made a simple game Map Editor and I want to save a array that contain map tile info to a file, as below: var arr:Array = [.....2d tile info in it...]; var ba:ByteArray = new ByteArray(); ba.writeObject(arr); ba.compress(); var file:File = new File(); file.save(ba); I had successfully saved a compressed object to a file. Now the problem is my server side need to read this file and decompress the array out from the file, then convert it to a Python list. Is that possible?

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• What factors influence you to try out a new framework or tool?

  - by VirtuosiMedia

  I'm in the process of putting the final touches on an open-source framework that I hope to release in the next few months. It's something that I'd like to develop a community for and so I'm curious about what factors influence your decision to use a new framework or tool and why. Some of the specific things I'd like to know more about (feel free to add to this): Types of documentation/tutorials/instruction Community support (comments/forum) Updates (blog/social media/feeds) Look and feel of the project website design White papers/testimonials A big feature list Community size Tools Ability to contribute Project test coverage (stability/security) Level of buzz (recommended by friends or around the web) Convincing marketing copy Ideally, I'd like to have all of the above, but what specific features/qualities will carry greater weight in getting programmers to adopt something new? What says, 'This is a professional-grade project,' and what are red flags that keep you from trying it out?

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• Tips for managing internal and external links using WordPress [closed]

  - by keruilin

  So I'm looking for ways to optimize my site for user and search engine purposes. I've read several articles and looked at several different plugins. To say the least, I'm thoroughly confused as what are the best practices for managing internal and external links. Here is a list of some of my questions: Which internal links should be set to "nofollow"? Which external links should be set to "nofollow"? To what degree does actively managing links contribute to your PR? Should you use "nofollow" blindly on all links in comments? If a link to an external site is broken (404 or whatever), should you "nofollow" that link? What about "noindex"? As you can see, lots of questions. I'm hoping that you experienced webmasters can give a newb some best-practice advice.

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• How can a Cisco Aironet wireless card connect to a WPA encrypted network?

  - by Aibara Iduas

  I have a Thinkpad T40 running Ubuntu 10.10. I want to connect to wireless networks with WPA encryption; they appear in the network list, but are grayed out. The card does support WPA, since it works in Windows. In 10.10 the wireless works just fine with unprotected and WEP networks, but cannot connect to any WPA networks. The card is a Cisco Aironet Wireless 802.11b. I've been reading a lot of forum posts trying to find a solution, but either encounter threads where no solution was found or answers longer apply (most date from 2007, since this isn't the newest of computers). Here is the output of sudo lshw -c network: *-network:1 DISABLED description: Wireless Interface product: Cisco Aironet Wireless 802.11b vendor: AIRONET Wireless Communications physical id: 2 bus info: pci@000:02:02.0 logical name: eth1 version: 00 serial: 00:02:8a:78:6a:44 width: 32 bits clock: 33MHz capabilities: pm vpd bus_master cap_list rom ethernet physical wireless logical configuration: broadcast=yes driver=airo latency=64 maxlatency=4 mingnt=4 multicast=yes wireless=IEEE 802.11-DS Thanks, any help would be greatly appreciated!

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• How do I change my 1080p external monitor from portrait to landscape on an Eee PC 1000H?

  - by Acky

  Hi I have an EeePC 1000H netbook with a Samsung T22A350 1080p 22" external monitor. I've just installed Ubuntu 12.04 and I mainly use the external display but when I select 1080 from the dropdown list, my only options are for a rotated portrait. My neck's non too supple, so tilting my head for extended periods is not really viable. :-) Any ideas on making ubuntu display 1080 normal landscape? It must be possible as using a gparted boot cd does it perfectly. Any help greatly appreciated. Cheers!

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• Is it safe to configure "Shutdown" on "When laptop lid is closed" ?

  - by Takkat

  To setup a laptop owned by a complete PC novice any settings that may become hard to tackle remotely need to be avoided. The laptop will be administrated via SSH. One thing in my list are problems arising from improper wake-ups from suspend or hibernate as they may also affect network accessibility. This is why I thought setting up power management to "shutdown" on closing the laptop lid could be a good idea. However I am not sure if this is a safe way to do. What problems in addition to software not closing properly (and thus not saving their data) could I be faced if I proceeded as planned?

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• Ubuntu Server Installer does not detect usb device

  - by Peter

  For some time now I am struggling with the 12.04 Ubuntu Server installer. I am trying to execute a clean, CD based install with the mentioned version onto an SD card. For the sake of the simplicity I have taken out the HDD. However, I had to recognise that the "disk detection" phase simply can not find the SDCARD. It says "No disk drive was detected. If you know the name of the driver needed by your disk drive, you can select from the list." What is really strange that I have tried the older Ubuntu Server installer (11.04) and this is simply recognising the sdcard... Does anyone have any idea? Many thanks, Peter

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• Save Zone Implementation in Asteroids

  - by Moaz

  I would like to implement a safe zone for asteroids so that when the ship gets destroyed, it shouldn't be there unless it is safe from other asteroids. I tried to check the distance between each asteroid and the ship, and if it is above threshold, it sets a flag to the ship that's a safe zone, but sometimes it work and sometimes it doesn't for (list<Asteroid>::iterator itr_astroid = asteroids.begin(); itr_astroid!=asteroids.end(); ) { if(currentShip.m_state == Ship::Ship_Dead) { float distance = itr_astroid->getCenter().distance(Vec2f(getWindowWidth()/2,getWindowHeight()/2)); if( distance>200) { currentShip.m_saveField = true; break; } else { currentShip.m_saveField = false; itr_astroid++; } } else { itr_astroid++; } }

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• How to specify 'root' in path in text file

  - by DeanGrobler

  I'm following this tutorial located here on how to create a launcher for eclipse in unity. Everything is going pretty well so far, I've managed to successfully create the launcher but when I click on it, my system complains that the path to the exec is wrong. My exec for eclipse is located here: ~/opt/eclipse/eclipse And if you look at the tutorial you have to create a file and set it's contents like so: [Desktop Entry] Type=Application Name=Eclipse Comment=Eclipse Integrated Development Environment Icon=eclipse Exec=./opt/eclipse/eclipse Terminal=true Categories=Development;IDE;Java; In my case I have to provide the full location for the exec and there are a number of things that I tried that didn't work I set 'exec' to 'Exec=~/opt/eclipse/eclipse' , 'Exec=/opt/eclipse/eclipse' and 'Exec=root/opt/eclipse/eclipse' and none of these worked.. What should I set it to in order to fix the path so that my luancher works? Update------------------ I tried to list those 2 directories and what i get is this:

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• Interview question ranking FizzBuzz (1), implementing malloc (10)

  - by blrs

  I'd like to have your opinion on the difficulty of the following interview question: Find the subarray with maximum sum in an array of integers in O(n) time. This trivial sounding problem was made famous by Jon Bentley in his Programming Pearls where he uses it to demonstrate algorithm design techniques. On a scale of 1-10, 1 being the FizzBuzz (or HoppityHop) test and 10 being implement the C stdlib function malloc(), how would you rank the above problem? I think the people who can best answer this question are those who have read Programming Pearls and have tried to solve this problem on their own. To motivate those who haven't, 'Programming Pearls' gets featured many times in the 'Top 10 programming books' list.

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• Subversion BI experience - not a very good one, but working now

  - by Kevin Shyr

  Suffice to say there is now a document in place and I'm the drill sergeant, harassing people to do proper check in, and throw out those who don't.Some people suggest that in a SSIS project, it doesn't really matter if developers don't have the latest version of the project since package check in put the package in the repository, which we can pull out later.  I beg to differ because:When people don't see the package, they might start creating one because their user story require the use of the table.  So they will proceed to create a package and override whatever might already be in the repository.I didn't really see anywhere in the repository to say that which packages were for "deletion".  So I ended up restoring them all, and send the list out to developers.  Then we get into the area where we are relying on people's memory.I'd love to hear other people's experience using Subversion to manage a BI project.

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• Choice of Operating System Version for Azure Roles

  - by kaleidoscope

  Customers can now choose when their applications receive new operating system updates and patches by selecting which version of the operating system their applications will run on in Windows Azure.  Right now there is only one available operating system version (released on December 17th, 2009), but new builds with the latest updates and patches will be released regularly.  This new feature allows developers to test their applications when new patches come out before upgrading their production deployments. To select an operating system version for your application, add the new osVersion attribute to your service configuration file.  The full list of available operating system versions is maintained in the Configuring Operating System Versions topic in the Windows Azure MSDN documentation.   Sarang, K

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• Fitting an established site into a CI framework

  - by David

  I manage a rather large, feature full nightmare of a site which has no end of feature creep settings/options/etc. Up to now its been coded in a procedural/functional way and would like to move to an OO,MVC setup. I'm quite new to it all but have done alot of research and feel that CodeIgniter is a code choice of framework to use to help quicken the transfer. Before looking at a framework, I started constructing a list of objects to create classes out of: photos users forum topics forums blogs blog posts comments The trouble I have now, is I do understand where these generic/universal objects fall into the CI MVC setup. What is the best way to organise this kind of stuff? These classes can generally be used on multiple models/views/controllers.

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• Using normals in DirectX 10

  - by Dave

  I've got a working OBJ loader that loads vertices, indices, texture coordinates, and normals. As of right now it doesn't process texture coordinates or normals but it stores them in arrays and creates a valid mesh with the vertices and indices. Now I am trying to figure out how can I make the shader use the correct normal in the array for the current vertex if I can't setnormals() to my mesh. If I were to just use an index in my array of normals corresponding to the index in the vertices, how would I retrieve the current index the shader is processing? BTW: I am trying to write a blinn-phong shader technique. Also when I create the input layout and I've added the semantic NORMAL to it, how would I list the multiple semantics in that single parameter? Would I just separate it with a space? PS: If you need to see any code, just let me know.

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