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I have no idea why Ubuntu will log out by itself without any notification. There are risks that I may not be able to save some important changes made to my documents, or totally lost the files that I am downloading.

Can anyone provide me some clues so that I now whether or not I should go back to Windows 7 pro?

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closed as off topic by jrg Jun 12 '12 at 16:32

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There's already a launchpad bug report on that. Until now nobody knows why it happens. Random logout after upgrading to Natty Narwhal 11.04 –  user18861 May 29 '11 at 9:53

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