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I use Ubuntu 12.10 recently installed. Now it cannot shutdown or restart. I remember it was shut-downed or restarted properly a few days ago. Now when I shutdown it, the screen turns to black swiftly that I only see a few statements beginning from "stopping ....". Any suggestion? Mike

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2 Answers 2

Try using the command reboot or shutdown -h now with root login. Give more detail about what error you get.

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I've used command you suggested and also click the upper-right corner commands. They are all right now. I really don't know why. –  Mike Liu Apr 11 '13 at 6:21
    
You said "They are all right now". Does it mean your problem is solved? –  Jay Apr 11 '13 at 7:09
    
Yes, the problem is solved. –  Mike Liu Apr 12 '13 at 13:43
    
If my suggestion helped you then you should select my answer as the correct one :) –  Jay Apr 12 '13 at 13:47

Try updating GRUB (sudo update-grub2). This solved the problem for me.

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