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What should I do when Ubuntu freezes?

I just upgraded to 12.04. Now, I can get into the desktop but after that point nothing works including keyboard and mouse. Therefore I am unable to use terminal. What do I do to get it working again?

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marked as duplicate by Eliah Kagan, fossfreedom Dec 29 '12 at 7:22

This question was marked as an exact duplicate of an existing question.

Hello, this question is vague and given nothing works I don't think it will be easy to diagnose and resolve. It may be easiest to just recover your data and reinstall:… – Jjed Apr 29 '12 at 6:16
This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :) – Seth Dec 29 '12 at 4:16

If previous to the upgrade you had messed with compiz settings, I guess I (and many other people) have been into the same issue. Solve it by resetting compiz settings to defaults.

I have an ATI Radeon HD5750, but I guess people with nVidia cards have also experienced the issue.

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You should try using another USB keyboard, as your existing keyboard may be the cause of problem. if even that does not work for you, re-install a fresh copy of 12.04 rather than upgrading.

Kindly describe specific problem you are facing. The more details you provide the more help you will get.

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