Fourth LTS (Long Term Support) release of Ubuntu, code-named Precise Pangolin. Released on 26th April, 2012. Only use this tag if your question is version-specific.

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Ubuntu 12.04 Unity: Black screen with cursor only, when external display is connected before booting laptop

Whenever I connect an external display to the DSub port of my laptop before booting into Ubuntu, something goes wrong in Unity to cause the exact same problem as described here: After logging in, ...
6
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113 views

How to stop reordering of the same kind multiple preview windows in task switching?

When using task switching in the default graphical mode of Ubuntu 12.04, if they are multiple windows of the same kind, eg. multiple Terminal windows, you can see them all together and select which ...
6
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2k views

Tata Docomo Photon 3g not working on 12.04 LTS

I recently upgraded from Tata Photon+ to Tata Docomo Photon 3G, however Ubuntu is not recognizing the device itself. I tried manually adding the device in Mobile Broadband section, using different ...
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2k views

How to install hp scanjet 200 in Ubuntu 12.04?

Unable to scan with hp scan-jet 200. When I type lsusb command in terminal it shows the scanner details. I opened the simple scan which displays no scanners found, and x sane image scanners also ...
4
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145 views

How can I prevent my laptop auto suspend (due to critically low battery) from looping?

I have an Acer Aspire 5750G on Ubuntu 12.04LTS and I've got a problem: Battery critically low > suspend > wake up instantly (I don't touch ANYTHING) > suspend > wake up.... power outage > dead. I've ...
4
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1k views

How to add Print Screen Functionality?

I just started with ubuntu minimal and LAMP stack.. Cinnamon is the GUI Now what i want is the print-screen functionality, so that when i hit the PrintScreen the screenshot must take place being ...
3
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58 views

chromium build fails due to `out of memory` allocation

i am trying to build chromium content_shell. But it fails at the last linking stage because of out of memory. Error Log: [1/1] LINK content_shell ... /usr/bin/ld: out of memory allocating ...
3
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296 views

14.04 - USB microphone speaker device not working anymore

I own a PJP-20UR web conference microphone speaker, I have been using this USB device for ages with Linux, Windows, Mac never ever have had any issues with it. Since I upgraded from Ubuntu ...
3
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39 views

Screen doesn't turn back on after powersave

I've run ubuntu 12.04 (64bit) for quite some time and I've never had any significant problem. Some days ago the update manager warned me about the HWE endlife support for ubuntu 12.04 and encouraged ...
3
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2k views

Nvidia after upgrade 12.04 to 14.04

I have some weird behaviour from nvidia drivers so far. My systemparts that are involved: nvidia GTX 560 Two Screens Ubuntu 14.04, fresh update from 12.04, When I execute sudo nvidia-settings and ...
3
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1k views

Could not calculate the upgrade, Upgrade 12.04 to 14.04

I get the error Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade. This can be caused by: * Upgrading to a pre-release version of Ubuntu * Running ...
3
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216 views

How to switch workspace via the Unity Desktop ICON via Mouse Wheel Specifically

I want to wheel over the "Workspace Icon" in the Unity Switcher to change desktops. (I know you can switch workspaces via COMPIZ which is ok for wheeling the desktop), but I would like to wheel over ...
3
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484 views

Sound Driver is messed up, and mic doesn't work correctly under ubuntu 12

Quick Ubuntu12 sound pops on boot and shutdown, and MIC picks up non-existant static. Edit: please note, Audio out is fine. Issue On shutdown and boot I often hear a loud blast from the speakers ...
3
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267 views

Fn key combination *suddenly* stopped working for brightness only

I've looked at most of the questions relating to enabling hardware brightness control under Ubuntu with the Acer Aspire S3 laptop; initially these fixes worked, under the initially installed kernel ...
3
votes
0answers
149 views

nofile limit not changed for sh command in non-interactive session

Running 12.04.3 LTS A user submitting a batch job to the queue was receiving a 'too many open files error' Investigation suggested changing the /etc/security/limits.conf file which has been ...
3
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65 views

İnterfaces exceeds the height of the screen

I use a notebook with small screen, 1024:600 resolution with Ubuntu 12.04 LTS. When I try to save or open a document, the interface is exceeding the height of the screen leaving the buttons out of ...
3
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574 views

How to count battery cycles?

Like most user that have searched about knows, Manufacturers ACPI implementation is a mess. And for most of our laptops, battery infos are unavailable or wrong (on a dell inspiron 15z, the rate is ...
3
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0answers
145 views

LibreOffice Base in Ubuntu 12.04 LTS: Screenshot showing too small database number field

If I ask LibreOffice base to show me the result of a query, the resulting screen will show the total number of datasets and the number of the currently selected dataset on the bottom left. However, ...
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431 views

Mouse scroll wheel does not work for ubuntu 12.04 running under Hyper-V for Windows 8 Pro

I'm using Ubuntu 12.04 lts on a Hyper-V virtual machine (MS Windows 8 Pro) and I need some help with the mouse driver. The mouse responds fine in general: the cursor's moving, left/right click works ...
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600 views

No sound after update on Ubuntu 12.04

As the title says, my sound has gone missing after an update with update-manager. I have found the solution before, but then had to reinstall Ubuntu. It can't even detect my audio card. Here is a ...
3
votes
0answers
2k views

Error During Apt-Mirror Unattended Install Of Ubuntu Server 12.04 Over Network Using PXE

I'm attempting to PXE boot and completely rebuild a new server with an "Ubuntu 12.04 Server" image over the network using apt-mirror but I get multiple errors mid-way through the installation. I am ...
3
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265 views

Despite ssh-agent, TortoiseHG keeps asking for the passphrase

I am using Ubuntu 12.04 and TortoiseHG to access repositories in Bitbucket. I use ssh keys for authentication. I run: ssh-agent then ssh-add and enter my passphrase. I can now use Mercurial and ...
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314 views

Wireless Problems After Resume

[Edit 3: Before you read all of this, I don't think this is a software issue anymore, so I'm not sure if there's a real solution that can be offered. I saw this video and read some of the comments. It ...
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221 views

Switched to Compiz for OpenGL on Xubuntu 12.04, now laptop screen doesn't turn on after a suspend

I recently added the CompizConfig settings manager to resolve screen tearing while watching full screen video (it worked! no more tearing!) but now every time I close the laptop screen and the system ...
3
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0answers
4k views

play audio through bluetooth speakers in 12.04 using CLI

I have gone through the whole gamut of trials with setting up playing audio through bluetooth and have not been able to make it work reliably (i.e., got it to work one time, and has not worked after ...
3
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591 views

wifi usb dongle detected but no wlan interface

I'm using ubuntu 12.04. When I insert my philips PTA01 usb wifi dongle, in dmesg i can see: [ 1181.535290] usb 2-3: new high-speed USB device number 4 using ehci_hcd [ 1181.684074] usb 2-3: New USB ...
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0answers
228 views

Configure ibus to generate “à” using Compose + a + `

I would like to have ibus work like to corresponding system in OS X. In order to get an "à" in a text field I want to make these steps: I press the Compose key I press the a key (an "a" appear in ...
3
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409 views

Execute a shell-script when closing laptop lid

Now I have two scripts and I want to execute them respectively when I close the laptop lip and open it. How can I do this?
3
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0answers
2k views

/dev/nvidiactl not present

I have an NVIDIA GT 540M (based on lspci output) graphics card and am trying to install its drivers. I have tried various options like downloading from NVIDIA's website, CUDA 4.2 homepage (Cannot post ...
3
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0answers
263 views

lvm disappeared after disc replacement on raid10

here my problem: I am running ubuntu 12.04 on a raid10 (4 disks), on top of which I installed an lvm with two volume groups (one for /, one for /home). The layout of the disks are as follows: Disk ...
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404 views

How can I monitor cloud-init for errors, and trigger a script when it fails?

I'm using cloud-init to provision servers in AWS, and would like my servers to send an email when they're done (whether they fail or succeed). For successful cloud-init runs, the solution is trivial. ...
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213 views

ubuntu 12.10 lock-screen unlockable with old ldap password

I have an ldap server that serves Ubuntu clients and there is a problem when unlocking the screen after a user has changed their password. Initial login works as expected: the user can log in with ...
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308 views

msmtp not working?

I was trying to send mail from bash, but it doesn't work and I can't find the reason... So my .msmtprc file is account default host smtp.gmail.com port 587 from account@gmail.com tls on tls_starttls ...
3
votes
0answers
193 views

Thunar not displaying thumbnails for text files

I have gone through all other posts on thunar thumbnailing issue but this one doesn't seem to match any of those; nor on the web anyone seems to have this problem, so I couldn't find solution on ...
3
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0answers
938 views

Error while recording a RTSP stream with avconv

I need to losslessly record a RTSP stream of an Axis 211a camera using avconv on Ubuntu 12.04. I am using this command : avconv -rtsp_transport tcp -f rtsp -i rtsp://<IP>/mpeg4/media.amp ...
3
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308 views

How to package shared library in deb packages

My application uses some shared libraries, which i need to package with the binary, and as per Debian Policy Rules It is recommended that supporting files and run-time support programs that do not ...
3
votes
0answers
382 views

Screen tearing on videos (not flash videos)

I mean video files on my hard drive. I get noticeable screen tearing on VLC, Totem, gnome mplayer and Mplayer. I have tried fglrx drivers and now the experimental AMD drivers. I have a Radeon HD6950 ...
3
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197 views

Encrypted home directory not auto mounting with .profile

I have Ubuntu 12.04 server edition with home directory encryption enabled. Logging in locally automatically decrypts and mounts my home directory and loads my zshrc. But logging in via ssh just drops ...
3
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923 views

Tor Browser Bundle's version of Firefox [Tor Browser] is recognized as the main Firefox installation [Ubuntu 12.04]

Whenever I run the start-tor-browser script to run Tor-Browser-Bundle, the Unity3D launcher stacks it with the Firefox shortcut I have on there as if it's another window of Firefox, unlike before when ...
3
votes
0answers
718 views

Set master mode on a realtek rtl8192ce

The supported interfaces of the network adapter include also AP. But when I try to set the card on Master Mode with iwconfig wlan0 mode Master, I get the following error: Error for wireless ...
3
votes
0answers
1k views

make windows float behind xfce panel

I would like to make it so windows maximize behind the xfce panel. basically so that all windows DO NOT treat the xfce panel as a dock. I noticed that if I move the XFCE panel away from the ...
3
votes
0answers
396 views

How to get 12.04's login screen (lightdm) to display the shutdown menu like 10.04 when the computer's physical power button is pressed?

In Ubuntu 10.04 while at the login screen (gdm), when the computer's physical power button was pressed a screen popped up that offered options on shutting down the system (shutdown, restart, cancel, ...
3
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0answers
119 views

How to manage colours of monitor?

When I was on Windows 7 there was a program: Intel HD Graphics control panel. My notebook: Acer Aspire 5750G Integrated videocard: Intel HD graphics discrete video card: Nvidia 630m How can ...
3
votes
0answers
435 views

How to create dm-crypt device in LXC?

On one LXC container I need to put sensitive data, preferrably stored in dm-crypt encrypted filesystem. When I write sudo cryptsetup luksFormat --cipher aes-xts-plain --size 512 ...
3
votes
0answers
81 views

applications linked to workspaces

I have just upgraded to Ubuntu 12.04 and I found a weird behaviour in the multi-workspace management. Let's say that I have a couple of terminals opened in one workspace, and that I want to do ...
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Thinkpad T530 with Optimus and Docking Station

I have a Lenovo Thinkpad T530 with Optimus video, which is not supported on 12.04.1. I don't normally need the discrete (nVidia) graphics, so I turn it off in the BIOS settings to achieve longer ...
3
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0answers
2k views

Video driver Radeon x1200

I got the issue when I play flash games or videos it's too slow. I reinstalled Ubuntu and it worked smooth for like 5 hours then I rebooted and it was slow again. When I type sudo lshw -C display ...
3
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334 views

mystery of missing file modifications (hybrid drive + Ubuntu 12.04)

Last week (Sep 10) I worked a whole day (on my Ubuntu 12.04 HP elitebook 8530p laptop) using a tex editor (TexWorks) and Jabref to maintain a Bibtex library. Today however I noticed all my ...
3
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0answers
2k views

How can I configure a Canon Pixma MG5300 to print wirelessly?

How can I configure a printer to print wirelessly in ubuntu 12.04 ? I have a canon pixma mg 5300 series, and I am able to print correctly by usb (the drivers were installed). Now I'm trying to do it ...
3
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724 views

Receiving Bluetooth Files from Nexus 7

I have successfully paired and connected my Nexus 7 with my Ubuntu 12.04 PC. I have successfully sent files from the PC to my Android device, but when I try to send files from Android to Ubuntu, the ...