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• Gnome Shell installed not working in Ubuntu 12.04

  - by user68180

  I had Gnome Shell working perfectly on my desktop, and I tried to install it on my laptop by the exact same method, (tried apt-get, synaptic and software centre), but it won't work. It seems to install fine with no errors. If I select "Gnome" at login, I get the "Gnome Classic" interface rather than Gnome Shell. My laptop has sufficient specs to run Gnome Shell. Am I missing something? EDIT: I have just discovered that under System Details Graphics, it says "Unknown". So, Ubuntu hasn't recognised my graphics card, and I'm guessing this is why Gnome Shell can't work. I have a nVidia GeForce GT 525M. How can I get it working? (as you may have realised, I'm a linux noob)

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• After 12.10, no GUI can authenticate for administration, such as Software Center

  - by Mike Crowe

  I upgraded to 12.10, and now I can't use Software Center or Network Administration. It keeps giving me an authentication errors. When I check /var/log/auth.log, I see: Oct 31 21:10:45 mike polkit-agent-helper-1[4665]: pam_unix(polkit-1:auth): authentication failure; logname= uid=1000 euid=0 tty= ruser=root rhost= user=root Oct 31 21:10:51 mike polkit-agent-helper-1[4667]: pam_unix(polkit-1:auth): authentication failure; logname= uid=1000 euid=0 tty= ruser=root rhost= user=root I found a post which said to change my password, which I've done (both through the Ubuntu settings GUI tool, and through recovery mode. No avail. Any suggestions? TIA M

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• Cannot install build essential from the CD?

  - by munir

  After a fresh installation of Ubuntu 10.10 I tried to install build-essential from the Ubuntu installation CD. I put the cd in the cdrom and in the software repositories i checked the box install from cd(Ubuntu 10.10 release Maverick Meerkat). Then I reloaded the software repositories. The synaptic manager then tried to download some repository related files but failed to do so as i didn't have internet connection. Then I open a terminal and wrote sudo apt-get install build-essential. It prompted me if I want to install build essential y/N. I typed y but the terminal showed some errors and was not installed. I also tried to add the CD in the software repositories. I clicked add and it prompted me to insert a CD while the CD was still inside the cdrom. I clicked "ok" then and it showed it could not find any cd. What is wrong?

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• How do I get to the maintenace shell?

  - by Narida

  I'm asking this because initially, my problem was this (power failure during installation, so I typed the following instructions in the maintenance shell: sudo mount -o remount,rw / sudo dpkg --configure a sudo mount -o remount,ro / sudo sync sudo reboot The first three lines worked, afterwards, my computer (a Dell Inspiron 530) got stalled for several hours, so I unplugged it. When I turned it on, the log in screen appeared, and after I try to write my password, it leads me back to the log screen. I must note that when I typed the first three lines during the maintenance shell mode, it said that the errors which were encountered during processing were: initscripts bluez gnome-bluetooth So, what do I have to do in order to get back to the maintenance shell so I can type code again? And, what code do I have to write in order to restore my computer? Thank you for your attention.

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• Converting a WIndows Store App to Android

  - by pm_2

  I cross posted this from SO I'm very new to Xamarin. I have a few published Windows Store apps and want to convert them to Android. I'm attempting to use Xamarin for this. I'm just using the free version of Xamarin. Here's where I am so far: I am trying two apps - one was build with Monogame and one is just build on the WinRT framework. I have managed to get them both into Xamarin studio, basically by hacking the csproj files. I'm getting build errors because it's missing references. There does appear to be some equivalent Mono / .Net4 libraries, but things like Microsoft.Xna.Framework seem to be missing. So, my question is: am I going about this the right way and, if so, am I missing a step ("convert dependencies" or something)? If I'm not going about this the right way then how should I be doing this (I found very few online resources on this subject)?

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• returning null vs returning zero, which would be better?

  - by Dark Star1

  I inherited a project that I am managing and having to maintain pending the redevelopment of the code base. At the moment I am being tasked with adding little feature all over the place and have gotten into the habit of returning null instead of zero in parts of the code where I am working on. The problem is we have a client that is using this code and parts of code that require data from my implemented features recieve a null and dump the stack trace in UI. I would like to avoid this entirely from my input but without the nullPointer exceptions there's the potential that errors would be introduced into the client's data which may go un-noticed. Usually I would have come up with my own error notification system but I have never inherited a project before. so I am unsure whether to continue down this path. I still believe that the stack dump is preferable to un-noticed data corruption/inaccuracies.

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• Ubuntu boots into terminal

  - by DKuntz2

  When I turn on my computer (a CR-48), I keep loading tty1. I have tried xstart, and all I get is: Fatal server error: Could not create lock file in /tmp/.tX0-lock When I attempted to make the directory (both sudo and not), I received these two errors: sudo: Can't open /var/lib/sudo/don/tty2: Read-only file system (I've gotten other tty's for different virtual terminals) mkdir: cannot create directory '/tmp/tX0-lock': Read-only file system Before I got to the only terminal state, I had the computer moving a few files from a network server to the computer, I put it to sleep without stopping the transfers, and started the computer again away from my home network, and attempted to stop the transfers, the computer than restarted. Running sudo reboot puts me right back in the virtual terminal, and I can't get into any sort of x application.

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• Is there any way to prevent Googlebar from breaking Friendly 404s

  - by TecBrat

  This might be considered a continuation of this question. If I output HTML after my 404 header, It displays properly in IE and FF unless the user has Google bar instaled. If I try header('HTTP/1.x 404 Not Found'); header("Location: http://www.example.com/?content=404_error"); die(); then I'm getting 302 from the redirect. It seems to overrule the 404 Supposedly if your output is larger than 512 bytes, the toolbar isn't supposed to override the page, but It seems to do it anyway. I found a setting in Google's Toolbar that said "Provide suggestions on navigation errors". Turning that off provides me with the behaviour I want my visitors to experience. Does anyone know if Google provides a way for a developer to over-ride that setting for all visitors?

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• Picasa packages for Ubuntu are no longer available

  - by David

  While trying to install Picasa for Ubuntu, the following errors occurred: wget http://dl.google.com/linux/deb/pool/non-free/p/picasa/picasa_3.0-current_amd64.deb && sudo dpkg -i picasa_3.0-current_amd64.deb --2012-08-30 17:41:36-- http://dl.google.com/linux/deb/pool/non-free/p/picasa/picasa_3.0-current_amd64.deb Resolving dl.google.com (dl.google.com)... 74.125.237.128, 74.125.237.142, 74.125.237.136, ... Connecting to dl.google.com (dl.google.com)|74.125.237.128|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2012-08-30 17:41:36 ERROR 404: Not Found.

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• Skype installed or not installed, that is the question

  - by Merle

  After upgrading 11.10 to 12.04, I noticed that Skype 2.2.0.35 was no longer on the sidebar of icons. Found it in Dash and it runs but no sound. Figured I'd check Ubuntu Software Center and reinstall but it indicates a different version - 2.2.0.35-0precise3 - and indicates that Skype is not installed. Attempting to go ahead and install errors saying that it can't install when skype is already installed. sudo apt-get remove skype ...says "Package skype not installed" Tried to update apt-get but that didn't make any difference. Seems like it would be best to straighten this all out so it's right and, presumably, the newer version is probably better to have installed. Can anyone step me through how to do so?

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• How to reinstall latest Ubuntu Touch on Nexus 4?

  - by Galen Gruman

  I've followed the instructions on https://wiki.ubuntu.com/Touch/Install, first doing the steps that lead to phablet-flash -b and then the manual ones. In both cases, I get stuck at the Google boot screen. It does not boot into Touch. No errors during manual install, and adb devices shows the device, but I get the following with phablet-flash or phablet-flash -b (second and subsequent times, not the first time): Device detected as /system/bin/sh: getprop: not found Unsupported device, autodetect fails device When working on flipped images, detection does not work and would require -d Not clear what that all means. The Nexus 4 had the initial Touch dev preview on it, FYI. I saw no separate instructions for upgrading from that.

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• Developing instincts and "subconscious debugging" [closed]

  - by ggambett

  For some time now (a couple of years, perhaps?) I've noticed something that happens when I'm writing code. I write something with a syntax error, or some other subtle error. I don't really notice it on a conscious level, but I have a weird feeling about what I just wrote. I then try to compile it and I get a warning or error on the line that provoked the feeling. Lately I've been trying to pay attention to these feelings as they happen, and more often than not, I find errors right there. It's like I'm developing a subconscious debugger (or at least subconscious syntax checking ;)) I've heard of people fixing bugs in their sleep (I did a couple of times), but I don't think I've heard this kind of thing. Does it happen to someone else?

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• Mount external HD ubuntu 12.10

  - by Luigi Tiburzi

  Although it's an abundantly treated matter, I'm unable to find an answer valid for my needs. I had a 12.04 installation of ubuntu and I decided to install the 12.10. I copied (using GParted) the partition where my system was to an external hd where there is a windows partition. Then I installed the newest ubuntu version and now I want to take back some files (for example my .emacs) from that partition but when I try to mount it, it is not found as sdb and if I mount it from /dev/usb/hddev0 I don't get any output, only a blinking cursor, no errors, no output. I even tried to mount it as an ntfs disk but the result was the same. It's like the hd cannot be detected. So how can I access data to that disk? Could I get them from GParted terminal instead of Ubuntu one? Thanks

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• Project life cycle management - Maven vs 'manual' approach

  - by jb10210

  I have a question concerning the life cycle management of a/multiple project(s), more specific to the advantages/disadvantages of using technologies such as Maven. Currently we work in a continuous-integration environment but lots of things still need to be manually performed (dependency management, deploying, setting up documentation, generating stats, ...). My impression is that this approach often leads to errors, miscommunications or things just are forgotten. I know and have used Maven in the past but in smaller environments and I was always really enthusiastic about it. But I was wondering if someone could share some insights, experiences, pros, contras, ... about the use of Maven (or similar technology) in larger environments and for multiple projects. I would like to use the suggestions made here to start the debate about moving to the next level in project management!

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• /dev/sda2 contains a filesystem with error after partitioning

  - by Private

  I just wanted to create a separate home partition on my Ubuntu 12.10 system. I booted the liveDVD, resized the sda2 partition (28gb of data resized to 30gb based on MiB [originally on a 100gb partition]) and made a new ext4 partition for the home folder. The drive is an SSD drive. I had changed the settings (noatime etc.) for SSD succesfully a week ago. On reboot I get the following error: /dev/sda2 contains a filesystem with errors Inode 74669 has an invalid extent node (blk 6881289) fsd / [953] terminated with status 4 What would you suggest me to do? If I can avoid a clean install that would save me a lot of time (I had just done all the config). I was following this HOWTO, but I did not get to changing any of the files or configs other than those with gparted. I have a (two-week old) SSD Samsung drive which is functioning just fine (other specs see bottom of this question). Other specs: 64bit 12.10, i7, 8gb ram, nvidia.

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• Administrator user session only shows a terminal

  - by Saariko

  Weird problem: After upgrading to 11.10 (and I am sure that I worked with it for couple of days). We had a power failure, and now, when open the computer, what I get is a screen, with a scrollable list of users (administrator is one of them). When I select the administrator user, and login, I get on the top left a terminal window. That's it ! I don't see my regular ubuntu desktop. What's wrong? I have tried some of the issues mentioned here: Delete the .Xauthority sudo apt-get update *I had some DNS errors, so had to fic my /etc/resolv.config (works now) please advise.

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• kubuntu 12.04 won't start

  - by daker

  I have dual boot config with kubuntu 12.04 and Windows7. My problem started this morning when I tried to boot kubuntu. Everything worked fine a couple of days ago and I have not done any mayor system configurations since then. Choosing kubuntu options from grub gives me this screen A couple of minutes later this screen is shown And then it gets stuck. Have been waiting for ~5mins without anything happening. I have tried running fsck from recovery menu without any errors. I have also tried booting in failsafex mode which gives me "Fatal server error: no screens found". apt-get update gives me "Duplicate sources.list entry". I have also tried fixing broken packages from recovery menu. What should I do next?

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• Not able to create Live CD

  - by Jagannath Harati

  I downloaded 12.04.1 on a Windows 7 machine. I burnt a DVD from the ISO image using Windows Disc Image Burner. I had 'verify disc' on. The disc was created successfully with no errors. I was not able to use this disc for installing Ubuntu on another Windows 7 machine. I do not get the Welcome Screen on booting. I find that on the disc I burnt, I do not find bin, disc tree, programs directories and cdromupgrade, start.*, ubuntu* files. I found the boot directory and WUBI executable file. I tried downloading several times with the same result. I had similar problem earlier with 11.04. Can you please let me where the problem is?

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• Synchronise graphics and logic code

  - by Skeith

  I have a procedural approach to the game loop that runs various classes. it looks like this: continue any in progress animations check for used input apply AI move things resolve events such as collisions draw it all to screen I have seen a lot of posts about how drawing should be running separately as fast as it can, possibly in another thread. My problem is that if the drawing runs as fast as it, can what happens if it tried to draw while I'm still applying the AI or resolving a collision? It could draw the wrong thing on screen. This seems to be a well established idea so there must be an explanation to this problem as I just cant get my head around it. The only solution I have is to update the screen so fast that any errors like that get refreshed before we see them but that sounds hacky. So how does this work / how would you implement it so that they are in sync but running at different speeds?

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• Linux OpenGL programming, should I use GLX or any other?

  - by pahnin

  I'm new to OpenGL and found that there are a lot of libraries to do that in C, and I also found that glx is most friendly with Linux X Server, I just want to do basic stuff, and I cannot find any tutorials for GLX. Is GLX a bad thing? I just want to do some small graphical things without installing many libraries and getting confused. Can anyone suggest me something which has tutorials and simple to compile? I found a link with an example with GLX and it worked perfect with no errors: anyone please suggest where I can find nice documentation or any better libraries.

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• Google is still crawling and indexing my old, dummy, test pages which now are 404 not found

  - by Ace

  I have set up my site with sample pages and data (lorem ipsum, etc..) and Google has crawled these pages. I deleted all these pages and actually added real content but in webmaster tools, i still get a lot of 404 errors Google trying to crawl these pages. I have set them to "mark as resolved" but some pages still come back as 404. Furthermore, I have a lot of these sample pages still listed when i do a search of my site on Google. How to remove them. I think these irrelevant pages are hurting my rating. I actually wanted to erase all these pages and start getting my site being being indexed as a new one but I read it's not possible? (I have submitted a sitemap and used "Fetch as Google.")

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• tty1 prompt before lightdm

  - by David Weldon

  After upgrading to 13.10, every time I boot I'm shown a login prompt (tty1) for ~30 seconds before lightdm automatically starts. Everything works fine after that. Any ideas on what I could try to fix/debug this? My /var/log/lightdm/x-0-greeter.log contains lines like the following: ** (at-spi2-registryd:1381): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files ** (at-spi2-registryd:1381): WARNING **: Unable to register client with session manager WARNING: Failed to open sessions directory: Error opening directory '/usr/share/lightdm/sessions': No such file or directory ** Message: PID 1534 (we are 1534) sent signal 15, shutting down... ** (gnome-settings-daemon:1401): WARNING **: Name taken or bus went away - shutting down Searching for these errors results in a variety of bugs filed over the years. Maybe a clean install will fix this.

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• Error after installing Lubuntu 14.04 through liveUSB

  - by Veritas

  A friend asked me to install ubuntu on his toshiba NB 200 netbook to replace windows xp. I formatted the flash drive, ran an nb5sum check on the iso and after running netbootin , I checked the drive for errors. No problems so far. During the installation, while everything seemed normal, the installation regularly paused until I pressed a button or moved the mouse. After restarting, it doesn't boot and it starts a shell showing : "General error mounting filesystems A maintenance shell will now be started CONTROL-D will terminate this shell and reboot the system " Any ideas? Any help is appreciated!

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• Internet keep dropping in Ubuntu 12.04

  - by Kokuryuu

  I am having an issue with my Ubuntu, I keep getting "server not found" errors when I try to go online, I have tried pinging my DNS and Goggle, and it seems like no packets are dropped, but still my Internet is not working Also my other PCs in the house have working Internet connection. I am sure there is no firewall active here, also nothing on my router is blocking, and I checked cables. I have no issues in the same PC in Windows. It is only in Ubuntu. Any ideas?

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• Kubuntu screensaver won't autostart

  - by Bumpalot

  Am using Ubuntu Lucid + kubuntu-desktop. NVidia works fine. Screensavers set to autostart & worked fine after initial install. Now screensaver attempted to start (brief flash of black only) but since quit doing that.. All screensavers work fine in Test mode. Is there a file entry that controls this?. kde/autostart is empty - should there be an entry here? Would the log files show up any relative errors? I am a newbie & the log info is way out of my league! Have not found any relative posts here or other forums. I would appreciate suggestions.

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