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I'm relatively new to Ubuntu but I kind of love it. I had 11.10 installed on my computer and it worked like a charm. However since installing a 12.* Version I have several problems, which make my desktop kind of unusable.

I had troubles with a black screen flashing up and then, what appears to me, the window manager crashing. However some updates seemed to fix that problem.

Right now I'm constantly experiencing lags, the monitor freezes for 1-2 seconds on a regular and reoccuring basis. What's more at some (random) point the computer completely crashes.

How to get information on those crashes? How can I determine what's causing the freezes?

EDIT:

Seems like the last systemlog message at least for the last crashes is: ntpdate[2251]: adjust time server [someip] offset [some small number] sec

EDIT 2: Could it be related to: https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1069543? I had some issues with my wireless card, but right now im connected via wire

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Install graphics drivers. I had similar problems with the open source drivers. –  Benjamin Kaiser Apr 8 '13 at 12:11
    
As for where the errors are, open gnome-system-log (probably called log viewer or something in the dash) and browse the logs there. –  Benjamin Kaiser Apr 8 '13 at 12:12
    
Thanks for your answer, i'll try to get some more details. BTW the log sais: "kernel [...] [drm:_gen6_gt_wait_for_thread_c0] ERROR GT thread status waut timed out", 6 times in a row with different numbers instead of [...] –  Patrick Apr 9 '13 at 10:41
    
Sry, my mistake the errors mentioned produced no crash. There's noting in the logs corresponding to the last crash :( –  Patrick Apr 9 '13 at 11:00
    
As for the graphic drivers im running an intel i5 with integrated hd4000 and according to ubuntuforums.org/showthread.php?t=2089640 i don't need drivers –  Patrick Apr 9 '13 at 11:36
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