I also experience shutdown hanging.
In case this helps, this is what I see upon shutdown:
Ubuntu 13.04
. . . . [OK]
* Killing all remaining processes... [fail]
nm-dispatcher.action: Caught signal 15, shutting down...
* Deactivating swap... [OK]
umount: /run/lock: not mounted
umount /run/shm: not mounted
mount: / is busy
* Will now halt
64 bit, nvidia-304 driver (that's what nvidia-current installs)
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https://bugs.launchpad.net/bugs/1170911
Title:
umount error messages during shutdown
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