Same happens to me.
I'm using Hardy too.
After having this problem, I ran the following in the console
~$ dmesg | grep nautilus
[ 616.774634] nautilus[6303]: segfault at ab000020 eip b766b2d6 esp bf825070
error 4
so it seems to be some kind of nautilus problem.
** Changed in: ubuntu
Status: New => Confirmed
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Ubuntu freezes at shut down / restart
https://bugs.launchpad.net/bugs/268423
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