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I upgraded Ubuntu 12.04.1 to Ubuntu 12.04.2 . After keying in the password on the login screen, Ubuntu just stuck there. i entered the console, killed the gnome-session, and successfully logged in. Just now,i found another problem: Ubuntu couldn't wake up after sleeping.

What's could be the cause of this situation?

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One thing that is different between Ubuntu and Windows is that in order to resume from sleep, you have to push the power button (at least on my laptop). Does that resume it? –  user132499 Feb 16 '13 at 6:07
    
Welcome to Ask Ubuntu! Try to keep questions to just a single issue. Could you edit your question about suspend/resume to include more information about your hardware. Suspend/resume issues can be very hardware specific, especially for laptops. –  chaskes Feb 16 '13 at 6:57
    
yeah.but it didn't work. Ubuntu didn't restore even the screen went black. will it be the problem of video drivers? –  user132486 Feb 16 '13 at 7:41
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