I have this problem on a clean install of 11.10. AMD Sempron on Biostar
790 mobo. I installed 11.10 from a live CD of about a month ago, it
worked fine, then updated and the problem appeared.

The machine sticks at the Kubuntu shutdown splash with the "balls"
active, nothing else happens. I can't get a terminal or response to any
key presses, but sometimes ctrl-del will bring up a full screen activity
log. Usually (not always) it's stuck at trying to shutdown modem-manager
with signal 15, there is [fail] in red on the RHS against it. More
random pressing of ctrl-del or ctrl-alt-del gets it moving again, line
at a time, until eventually it shuts down, BUT, it always reboots. No
combination of shutdown -h -P -r  now makes any difference, it ALWAYS
reboots.

I tried to kill modem-manager with sudo kill (process ID) before
shutting down, but it wouldn't die.

The only way to turn of the machine is the power switch, or sudo
poweroff --force

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https://bugs.launchpad.net/bugs/882817

Title:
  shutdown screen stuck after upgrade to Ubuntu 11.10

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