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What should I do when Ubuntu freezes?

I have a file server that was Windows Home Server. I reformatted the HD and installed Ubuntu 12.04 LTS and Amahai (greyhole, sickbeard, etc) System was working fine but for a while now it randomly freezes up, sometimes a white screen, sometimes vertical lines, sometimes black. I restart it and everything boots up fine, no issues.

All the hardware was recently working with no problems, did memory test, no problem. Ubuntu install with Amahai, fine for a week or so. I don't know if there were any auto updates, only possible changes I can think of. I already googled and disabled hibernate, screensaver, etc. and any other common crashes. When it crashes, I can't access any samba shares or ssh into it.

Where should I look to start to diagnose this issue?

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marked as duplicate by Jorge Castro, Stephen Myall, Ringtail, RolandiXor, fossfreedom Nov 22 '12 at 10:15

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1 Answer 1

I'd start with your log files in /var/log/, specifically starting with Xorg.0.log and syslog.

As to what you're looking for, anything that happened before the computer froze, looks suspicious or somehow related. You can then Google those and likely find the issue that way.

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The only thing I have found is: CIFS VFS: Unexpected lookup error -512 I'm not sure if this is causing the crashing though. –  user992244 Nov 22 '12 at 14:11

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