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What should I do when Ubuntu freezes?

System freezes and even seconds in clock stop. Keyboard no responds only mouse pointer moves but no left nor right click. How to fix?

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marked as duplicate by John S Gruber, Jorge Castro, Tom Brossman, Eliah Kagan, Mitch Oct 2 '12 at 9:43

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

What is your hardware specs? try to update your BIOS – user61928 Oct 1 '12 at 14:16
How to recome from freezing? – user61928 Oct 1 '12 at 14:17

Does this happen always after an specif event, or out of the blue?

Have you tried restarting the window manager lightdm from a tty?

  • hit Ctrl + Alt + F2
  • login
  • type: sudo service lightdm restart

This will close your apps though.

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