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What should I do when Ubuntu freezes?

I have a problem with my Ubuntu 10.10 system which regularly freezes and can then only be switched off via the mains switch. When I try to re-start the system I need to try repeatedly before it will log in.

How can I trace the reason for this and correct it?

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    See also What should I do when Ubuntu freezes? - though that's not a duplicate because it doesn't tell you how to troubleshoot the causes.
    – 8128
    Jan 15, 2011 at 20:58
  • What graphics card/chip do you run? lspci | grep VGA
    – wojox
    Jan 16, 2011 at 1:47
  • I don't know - how can I obtain this information?
    – Brian Buck
    Jan 17, 2011 at 17:55

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Just saw a link about something similar: Ubuntu Wiki Troubleshooting X freezes, hangs, and lockups. It may or may not be your problem, but that's a starting point.

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  • @Brian Buck What solved it? How did you troubleshoot? Write your own answer and accept it if you need to.
    – djeikyb
    Mar 17, 2011 at 11:35
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Open the log viewer from system->administration and look* for dmesg (reports kernel, network, boot and some overall info;eg will show if new HW is added) and xorg.log (the log for the graphic [server]). You'll then need the search for errors, most likely a graphic card/driver issue if you use Nvdia or Ati.

*if you don't see them directly, hit Ctrl+O and open the needed file, the file dialogue should be by default in /var/log.

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