I also have been getting this "bug" on two machines, each with a fresh Xubuntu 
13.04 install.
----------------------------------
umount: /run/lock: not mounted
umount: /run/shm: not mounted
mount: / is busy
----------------------------------
Shutdown process would take about 10-12 seconds, instead of the expected (for 
me) 2-3 seconds. Once in a while, it would trigger 'fsck' for a scan at bootup.

After unchecking "Available to all users" on eth0 through network-
manager, the problem is no longer present and my shutdown is clean. Will
do the same on my second machine and report.

** Attachment added: "Screenshot"
   
https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1019347/+attachment/3760850/+files/shutdown-bug.jpg

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https://bugs.launchpad.net/bugs/1019347

Title:
  A message: "mount: / is busy" appears every time shutting down or
  rebooting.

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