Hi, I was browsing on the net and found this link: http://ubuntuforums.org/showthread.php?t=2008576 . I think my problem is related to the "freezing plymouthd" that does not get killed on rebooting or shutting down.
As instructed in the link, I put a bash script which content was: #! /bin/sh ps -Af >> process.log in /etc/rc6.d before the "S60umountroot" script file. I opened the "process.log" file in root directory and find this: root 2842 2 0 18:27 ? 00:00:00 [kworker/0:3] root 2854 1 1 18:27 ? 00:00:00 /sbin/plymouthd --mode=shutdown root 2890 2 0 18:27 ? 00:00:00 [kworker/u:0] I did the first solution on the link. What I did was: 1. I renamed the file of "S60umountroot" that is in /etc/rc6.d and /etc/rc0.d to "S61umountroot". 2. Created a file named "S60perso-script" and set it to be executable in /etc/rc6.d and /etc/rc0.d . The content of the "S60perso-script" was as follows: #! /bin/sh ### BEGIN INIT INFO # Provides: # Required-Start: # Required-Stop: # Should-Stop: # Default-Start: # Default-Stop: 0 6 # Short-Description: Kill freezing plymouthd ### END INIT INFO PATH=/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games case "$1" in start) killall -9 plymouthd ;; restart|reload|force-reload) ;; stop) killall -9 plymouthd ;; *) ;; esac : {Source: http://ubuntuforums.org/showthread.php?t=2008576 } That's it! And, the "mount:/ busy message" does not appear again on shutting down or rebooting. And I think the problem was not in upstart. -- 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/upstart/+bug/1019347/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs