Comment 53 for bug 882817

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Thilo-Alexander Ginkel (thilo.ginkel) wrote : Re: [Bug 882817] Re: shutdown screen stuck after upgrade to Ubuntu 11.10

I think there is a major misconception:

halt (or shutdown -h) will halt your PC whereas poweroff (or shutdown
-P) will power it off.

The shutdown -h behavior has changed since Natty, but according to the
man page both variants are valid.

Easy fix: Use shutdown -P and your system should power off again.