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Since at least a month, my 11.10-64bit PC doesn't shutdown anymore from the GUI. It simply freezes on plymouth screen. If I open gnome-terminal and type "sudo poweroff", it shuts down correctly.

This is very annoying. I don't have any relevant message in the logs. It simply stops at "The system will be halted"...but it doesn't power off.

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Possible Duplicate Question: askubuntu.com/questions/26601/… –  Scott Stookey Feb 25 '12 at 17:52
    
I think it is not a duplicate. This is my behaviour: - if I type "sudo shutdown -h now", the system starts powering off until it displays "Will now halt". Then it hangs there, not powering off. - if I type "sudo halt -p", the system powers down correclty until it shuts off. –  Fabio Feb 26 '12 at 12:26
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4 Answers

up vote 1 down vote accepted

I have fixed this by adding the following line to the file /etc/default/halt:

INIT_HALT = POWEROFF

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While that solution didn't work for me on Ubuntu 12.04, I was able to solve the problem in another way:

I removed the Nvidia drivers, and the computer then was able to correctly shut down and restart.

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I had this problem. I updated grub and worked fine. Launch Terminal and type the following:

sudo update-grub
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Actually if you want to shutdown and power off the machine, you should type:

sudo shutdown -P now

-h:     Requests  that  the system be either halted or powered off after
        it has been brought down, with the choice as to which left up to
        the system.

-P:     Requests that the system  be  powered  off  after  it  has  been
        brought down.
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