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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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marked as duplicate by Marco Ceppi Jun 5 '11 at 20:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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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 '11 at 20:58
    
What graphics card/chip do you run? lspci | grep VGA –  wojox Jan 16 '11 at 1:47
    
I don't know - how can I obtain this information? –  Brian Buck Jan 17 '11 at 17:55

2 Answers 2

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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Thank you for your help. Problem now solved –  Brian Buck Feb 8 '11 at 18:33
    
@Brian Buck What solved it? How did you troubleshoot? Write your own answer and accept it if you need to. –  djeikyb Mar 17 '11 at 11:35

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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