Had this problem in 12.10 (upgraded from 12.04) and now in 13.04 (upgraded from 12.10). Unchecking "Available to all users" on the ethernet connection in network config seems to resolve it. The strange thing is, even though I have now re-enabled "Available to all users" on eth0, the problem is still fixed. Perhaps NetworkManager config just needed a jiggle. I've put some lsof debugging in /etc/init.d/umountroot in case it happens again..
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1019347 Title: A message: "mount: / is busy" appears every time shutting down or rebooting. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1019347/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs