Thank you for taking the time to report this bug and helping to make Ubuntu 
better.
Unfortunately, we can't fix it because your description didn't include enough 
information.

Next time this happens, can you switch to a text console by hitting
CTRL + ALT + F1, login  there, and then run
sudo apport-collect -l linux 369515
then run
sudo poweroff and see if the machine powers off

If the machine still won't shutdown then run
'top' and it might tell you what the machine is stuck on
thanks

-- 
system freeze while emptying trash
https://bugs.launchpad.net/bugs/369515
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