Using Kubuntu 14.04.1 amd64, I can confirm that plymouth is still running during shutdown at the point in time which was suggested to investigate via ps logging at comment https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1019347/comments/4
I do not get the "mount: / is busy" though. I get rather get "Stopping early crypto disks... [fail]" -- 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