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I am asking this as there does not seem a clear way to diagnose the problem. I have searched several sites including this one. After a few minutes Xubuntu freezes and I can't use the mouse or keyboard. I need to hard reboot but the cycle starts again. I have a desktop PC running Xubuntu 14.04 LTS on kernel 3.13.0-48-generic. It is an older PC.

Mudit Kapil
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Jacques MALAPRADE
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  • See if this helps https://wiki.ubuntu.com/X/Troubleshooting/Freeze – Mitch Mar 28 '15 at 11:47
  • you can find a lot of answers within this forum explaning that is usually video drivers issue I've also been to such a situation and the problem was nouveau driver after installing nvidia the problem disappeared. Check what video driver you're using is it stock? lspci -nnk | grep -iA2 VGA – JoKeR Mar 28 '15 at 11:49
  • The driver is: 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV620 LE [Radeon HD 3450 AGP] [1002:95c6] Subsystem: Hightech Information System Ltd. Device [1787:0028] Kernel driver in use: radeon – Jacques MALAPRADE Mar 28 '15 at 12:15
  • Would a graphics card driver stop the keyboard from working? – Jacques MALAPRADE Mar 28 '15 at 12:30
  • @JacquesMALAPRADE Did you try booting the system from an older kernel – Mudit Kapil Mar 28 '15 at 16:46
  • @MuditKapil I did. It still seems to freeze on the previous kernel. – Jacques MALAPRADE Mar 28 '15 at 17:34
  • It seems to happen every time I have firefox open and whilst browsing. – Jacques MALAPRADE Mar 28 '15 at 17:35
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    Check your CPU cooling fan. CPU may stop working due to high temperature.May be you need to apply a new layer of thermal compound for your CPU. – Lj MT Mar 28 '15 at 14:37
  • Have any of you tried the HWE kernel? Install it with "sudo apt-get install linux-generic-lts-utopic". If you use UEFI, you'll also need "sudo apt-get install linux-signed-generic-lts-utopic". This will install Linux 3.16 which is known to solve a lot of problems. – John Scott Mar 31 '15 at 19:57

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I am also seeing this issue on Kubuntu 14.04. It started after the update to kernel 3.13.0-48-generic

You can restart the system without hard resetting it by pressing Ctrl + Alt + F1 (brings you to command prompt) Login and then type: "sudo shutdown now -r" this will at least allow you to bring down the system cleanly.

I am going to boot into an earlier kernel until there is a new kernel. Here is a link to an article on how to do it: Pressing shift does not get me into any grub menu Update: Issue had nothing to do with the kernel revision

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user286904
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  • guys Ubuntu 14.04LTS uses 3.16.0.30 currently and it works fine I guess you better upgrade not downgrade. – JoKeR Mar 31 '15 at 20:25
  • Looks like the issue had nothing to do with the kernel as it happened with the previous one. My issue was with the Nouveau driver. Looks like Jacques has a radeon card so my issue must be something different then his. – user286904 Apr 02 '15 at 01:37
  • @joker I don't think 3.16 has been released for 14.04 yet. I have performed all the updates as of yesterday and I get 'code' $ uname -a Linux system 3.13.0-48-generic #80-Ubuntu SMP Thu Mar 12 11:16:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux – user286904 Apr 02 '15 at 01:45
  • I'm using standard Ubuntu 14.04LTS and since February it's got 3.16.0.30 kernel by default. You can run sudo apt-get install build-essential linux-headers-uname -r` it must say already the latest, if so maybe for Kubuntu is lower then. (there's ( ' ) mark before uname also. – JoKeR Apr 02 '15 at 20:24