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What should I do when Ubuntu freezes?

I installed ubuntu on my new computer (no other OS) , and it crashes suddenly all the time , There is no program that i specifically use when ubuntu crashes . When it occurs , I can't move the mouse or do anything , it stops disabling any move but doesn't shut down the computer or show an alert or something like that .

I use Ubuntu 12.04 64 Bit . My computer : HP Pro , intel i7 processor , ram 8go , nvidia gt520 2Go , 20" HP 2011x LED screen .

Excuse me if I made mistakes , english is my third language .

Please Help .

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When you restart, have a look at var/log/syslog it might show you the error –  zeref Oct 2 '12 at 18:09
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marked as duplicate by Marco Ceppi Oct 26 '12 at 19:01

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Have you tried rebooting into recovery mode? Press shift key when the very first purple screen appear than use check or fix filesystem. Have you tried updating everything ? In the update manager ? If non of that works try to reinstall ubuntu you could of have an bad install.

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