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I use Ubuntu 11.10. My problem is that I cannot power off the computer with sudo halt command. Ubuntu shutting down screen comes and stops at there (something like the pic below). I waited about 15 minutes which is abnormally long and am obliged to press the power button to shut down. The second try was the same.

enter image description here

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up vote 2 down vote accepted

Where is your problem? halt and poweroff are two different things, as explained in the halt manual.

You should launch it with

sudo halt -p

to poweroff it.

Anyway, from the man halt:

When called with --force or when in runlevel 0 or 6, this tool  invokes
the reboot(2) system call itself and directly reboots the system.  Oth‐
erwise this simply invokes the shutdown(8) tool  with  the  appropriate

So I think that could be a good idea to use shutdown directly, as this:

sudo shutdown -h now
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sudo init 0 works too – RobotHumans Mar 5 '12 at 18:49

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