>From your description it sounds like either an ACPI problem, or a
recurrence of a previous issue <a href="<a
href="https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1061639";>seen
here</a> that can cause the system to hang on shutdown with a tty
printout of mount: / is busy followed by a system halt. Try setting
acpi=force in GRUB, and if that makes no impact, try shutting down from
a tty, and note the output before it becomes non responsive. As a fix to
the previous issue was pushed out, make sure that you have the latest
version of ifupdown (should be 0.7.2ubuntu2). If all of this fails, add
more info, and that will make it easier to flesh out what is occurring
here.

~qbalazs

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https://bugs.launchpad.net/bugs/1160860

Title:
  Ubuntu not shutting down

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