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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Settings and configurations are not saved on Ubuntu 12.04 LTS

I recently installed 12.04 LTS. Whenever I rearrange the launcher icons they reset to their initial order after a reboot. Also, although I can change the time and date settings, none of the changes ...
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70 views

Applications menu does not find installed eclipse

I just switched from my company's version of eclipse to the stock Ubuntu version. However, when I did: sudo apt-get remove eclipse I found that my company's eclipse remained installed. I figured it ...
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404 views

Lubuntu 12.04 & Steam

I have a very old laptop (Pentium M 1800 inside :D), and installed Lubuntu on it. Because of problems with the PAE kernel, I used LUbuntu 12.04 alternate install as described here. This worked out ...
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72 views

Combine two hard drives

I have a PC with 2 physical hard drives, each is 500 GB (sda and sdb) I'd like to combine them in one large hard drive (1T). I couldn't find a clear approach on how to do it. I tried LVM with no ...
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617 views

How to disable xscreensaver lock on suspend?

I have recently installed Ubuntu 12.04 LTS and have installed xscreensaver. As I am the only user on this computer and I am only using the computer for music, movies, and some web browsing I have no ...
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329 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 ...
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79 views

12.04 LTS not able connect to internet when installed, but could connect using LiveCD before installation

I met a strange problem. When I use LiveCD to install ubuntu 12.04 LTS, I was able to connect to Internet through wired connection, choosing "Try Ubuntu". But when I installed it, it could not ...
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47 views

12.04 Unity - Windows Consistently Jump Behind Main Menu Bar

I have run a clean install of Ubuntu 12.04 LTS and installed all the latest updates, and have not made any alterations to the interface. However I am presented with a persistent problem: When using ...
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162 views

Issue Backporting SQLite 3.8.1 to Ubuntu Precise from Trusty

I'm pretty new to all of the packaging of Ubuntu applications and what not so this may not be the correct place to ask this question or there may be a more appropriate place to re-ask this question. ...
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113 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 ...
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46 views

Which non-free code gets installed by default in 12.04?

Which non-free components/programs ship with Ubuntu 12.04? I’m not referring to non-free software available from the repositories, but only to software that gets installed by default. (I’m not sure if ...
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409 views

How can I get multiple SYBA SI-PEX40057 (Marvell 88SE9230-based) SATA cards to play nice?

I've built a storage server using: Supermicro X9SCM-F motherboard Three Syba SI-PEX40057 PCIe SATA cards Ubuntu Server 12.04 LTS All twelve ports on the cards are populated with storage drives, as ...
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330 views

Stopping e-calendar-factory and e-addressbook-factory

How can I prevent e-calendar-factory and e-addressbook-factory from ever starting? If I manually kill the processes they just start up again? Between the two they are spamming google with 100 ...
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324 views

Binary package for gcc 4.8.2 on Ubuntu 12.04?

Following this answer, I have installed gcc 4.8.1 on Ubuntu 12.04 a couple of months ago. Unfortunately, I encounter bugs very frequently, varying from failing to compile valid programs to crashing. ...
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141 views

Canon MP600 USB-connected Scanner is not recognized by sane-find-scanner

I have a Canon Pixma MP600, which is supported by xsane with pixma backend. I have Xubuntu 12.04, this is the result of sudo sane-find-scanner -v command: searching for USB scanners: checking ...
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512 views

Up, down, right arrow keys and delete key not working

I have already read Delete and arrow keys not working and tried what is written there. I have also tried restarting my computer. I have also searched elsewhere for answers, but I haven't found any ...
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462 views

disable intel gpu in ubuntu 12.04

I am wondering if there is anything to disable the intel gpu on ubuntu 12.04. I want to be able to setup dual monitor using nvidia-settings. It seems the intel gpu is used for display as suggested by ...
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63 views

net_cls and ns subsystems not available in 12.04?

I'm playing around with cgroups and I noticed when I try to list all available subsystems that the network ones are not available ? Running the following command should list ALL available subsystems - ...
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177 views

Raid 5 mdadm --grow drops performance, no increase in disk size

I've set up a Raid 5 system at home for the first time. I've added 3 disks into the pc, and parted them all in 1 partition of 8G, and 1 partition of the remaining 492G then I made 2 raid volumes with ...
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237 views

Several keys on my ASUS desktop keyboard are not working in Ubuntu 12.04

After installing Ubuntu 12.04 on my ASUS G10AC, several keys on my keyboard (ASUS G01 KB) are not working at all. This includes both CTRL keys, both ALT keys, and both WINDOWS keys. When I use the ...
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226 views

Unable to select Chrome updates on Ubuntu 12.04

I own two machines, both of which are running Ubuntu 12.04. I use Google Chrome on both. A Google Chrome update is available, and it appears in the Update Manager. However, I cannot select the ...
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339 views

sharing between ubuntu 12.04 and windows8 with online user

I've searched for solutions and tried numerous things but nothing so far has worked. I'm trying to access shares on an ubuntu 12.04 pc from my windows 8 pc. In my win8 machine I can see the shares, ...
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170 views

NTPD segfaults on 12.04 LTS (64-bit)

Fresh install of Ubuntu 12.04 LTS. Installed ntp, but starting the service only results in the following error: grsec: Segmentation fault occurred at 0000000000000008 in /usr/sbin/ntpd[ntpd:28951] ...
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365 views

Ubuntu 12.04 won't shut down - stopping winbind daemon

My Precise Pangolin sometimes won't shut down - the screen is black with text on it. Mostly last line says something like stopping winbind deamon (sometimes also virtualbox, which is above winbind ...
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994 views

Crashing system - how to xhci_hcd unload and only allow ehci_hcd in Ubuntu 12.04, 13.04 for debug some usb hardwares

I have few USB hardware who is using 500mA (5V) power, after reserching found that external power supply or hub was the solution but that was a waste of time, even doing external power the problem ...
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845 views

USB Ports not Recognizing Devices?

I have a particularly odd problem, that I can't seem to solve. I recently just booted Ubuntu 12.04 LTS to my Desktop, the strange thing about it is, that only the USB 3.0 ports on the front recognize ...
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159 views

Low Quality Screencast with kazam and recordmydesktop?

I created my first screencast recently using Kazam screencaster and edited it in kdenlive. But the quality of video is low, pixelated. I tried RecordMyDesktop, it is buggy and doesn't show a few parts ...
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172 views

Can I have a Ubuntu 12.04 live usb work with both the -persistance and -toram additional boot options?

I really like using the Ubuntu 12.04 live CD/USB's "-toram" additional boot option for my laptop because "-toram" adds a few extra hours to the battery and makes things a little faster. I add the ...
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393 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 ...
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40 views

Infiniband + Maas?

I'm looking at setting up an HPC based on Mellanox Infiniband rather than Ethernet. Because I have many nodes to manage, I was looking at trying something new, like MAAS. I know Infiniband cards ...
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65 views

Is it necessary to change hostname following cloning to multiple machines?

I am cloning multiple laptops in a school environment with edubuntu 12.04. There are some network issues that have resulted with machines not connecting to the wireless. There are 130 machines in ...
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642 views

How can I create an X server that has a backing store?

So I am completely new to Ubuntu (I am running 12.04 on a Toshiba Satellite). I am trying to remotely access my work computer but I keep getting an error reading: "xevas: requires a X server that ...
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253 views

Install wont boot up, stuck on loading text dots / restarts

Friend gave me her laptop, we agreed on Ubuntu, but I have troubles even booting up live version (see the notebook). I tried 12.04 64bit on USB stick, it does nothing, when I choose booting live ...
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215 views

How do I perform maintenance on a master DNS/DHCP (BIND9/ISC-DHCP) Ubuntu server?

I'm running non-GUI Ubuntu Server 12.04.2 LTS (64-bit) on my 2 DNS/DHCP servers. Both servers are running BIND9 9.8.1-P1 and ISC-DHCP-SERVER 4.1.ESV-R4-0ubuntu5.6. Please note that for DNS I'm ...
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286 views

In Ubuntu 12.04, odd whining/humming coming from left side of MBP (2,2)

I have been searching for a similar issue to mine, but unfortunately haven't found anything. Anyhow, this week I installed 12.04 on my 2006 MBP (2,2). Pretty much everything seems to work OK, but ...
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316 views

Problem with bluetooth turning on in 12.04(Kernel 3.2.0-34 generic) on Dell insprion 1520

I've Dell inspiron 1520 Laptop and have installed 12.04 Ubuntu in it, I'm trying to turn on the bluetooth device on the system, In the notification bar it shows, bluetooth is turned on and under ...
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635 views

CUDA is not working on Ubuntu 12.04

I'm planning to start some CUDA development, so I'm trying to use the NVIDIA card that I have installed and I haven't yet be able to use (an NVIDIA Corporation GF108M [GeForce GT 630M]) because Ubuntu ...
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2k views

apt-get update is not working

Hello Ubuntu Community, I have been working with Linux for 5 years, and with those five years, I have never had a problem with the Ubuntu apt program. It usually works like a charm and is an instant ...
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518 views

Canopy Express in Ubuntu 12.04 32-bit doesn't start

I installed the 32-bit version of Canopy Express in my Ubuntu 12.04 32-bit machine. I followed the installation guides here. Then when I run the program I get the following dialogue: Permission ...
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1k views

Cannot ping to my router even though wifi is working

I recently installed Ubuntu 12.04. I have been unable to ping to my default local gateway, much less connect to the internet since my installation. Below is my output to ifconfig: Output of ...
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236 views

how to set an include system directory in the Eclipse Platform

From the 'Ubuntu Software Center', I have installed Eclipse Platform Version: 3.7.2. and 'eclipse-cdt C/C++ Development Tools'. In the eclipse Samples at Eclipse.org, I see only these for java, not ...
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251 views

RecipeCloudfoundry Chef Compile Error in cloudfoundry/vcap/dev_setup/cookbooks/cloud_controller/attributes/default.rb

I've just installed Cloudfoundry Server PaaS on Ubuntu 11.10 following this step-by-step guide. How do I install the same on Ubuntu 12.04? I have tried to install cloudfoundry v2 on Ubuntu 12.04 ...
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140 views

Problems installing 12.04 alongside Windows 8

I have a Lenovo Y400 notebook, and I hate Windows 8. So, I tried to install and dual-boot Ubuntu. I immediately ran into problems. First of all, 13.10 won't boot. Unfortunately, I haven't tried it ...
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397 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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411 views

Is it possible to move the top activities bar of gnome shell to the bottom of the screen?

I have set up a normal user account in my computer as a guest account, which lots of my friends use. I love the gnome shell, and I set it as the desktop environment. The problem users of my computer ...
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35 views

Panel settings do not appear on alt+right-click after installing 12.04

I have tried alt+right-click, super+alt+right-click, 1. alt(hold) 2. super(hold) 3. right click and many other "fixes" found in the askubuntu but none of them work. Can anyone help me?
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144 views

Terminal error: i2c i2c-0 sendbytes error -110

I am currently using a clean installation of Ubuntu Server 12.04 AMD64 and I keep getting errors popping up saying: [ xxx.xxxx ] i2c i2c-0: sendbytes: error -110 where x is the seconds the ...
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530 views

Changing default GCC Compiler in 12.04

I just downgraded from 13.04, which seems to have some stability problems right now, and moved back to 12.04.LTS. I installed the GCC 4.8 compiler, which is not the default GCC compiler on 12.04. I ...
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247 views

Server in LAN with two network cards, can't telnet / ping to the second even if it works

I have an issue with an Ubuntu 12.04 LTS (updated) server. For reasons too long to detail, it has got one eth0 interface assigned to 192.168.1.9 and one wlan0 interface assigned to 192.168.1.10. Both ...
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331 views

How to run mac os virtually on ubuntu 12.04

I am using ubuntu 12.04 stable version and oracle virtual box 4.1.2_ubuntu Have a iso file of snow leopard with me, When I run virtual box I got following error: FATAL! Could not read from the boot ...