*** This bug is a duplicate of bug 776999 ***
    https://bugs.launchpad.net/bugs/776999

This bugs looks like the issue in this thread 
http://ubuntuforums.org/showthread.php?t=1679008
And in this case it's not strictly related to ACPI (unlike bug #776999).

In this case, the issue (freeze shortly after unplugging AC) seem
related to a network driver issue, triggered by the disable_wol script
(in /usr/lib/pm-utils/power.d/disable_wol), so it's not really a problem
with pm-utils either.

Anyway, removing disable_wol stopped the issue in this case (I can now
unplug/replug the AC and mess with the network interface without freeze
or network issues).

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https://bugs.launchpad.net/bugs/787809

Title:
  ubuntu freezes when power plug is plugged in or out

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