A likely candidate for this could be the powersave scripts. Can you
please uninstall the pm-utils-powersave-policy package, and check if it
still happens?
If so, please reinstall it again, and try this instead:
sudo mv /usr/lib/pm-utils/power.d/95hdparm-apm /usr/lib/pm-
utils/power.d/95hdparm-apm.orig
If it still happens, please move it back with
sudo mv /usr/lib/pm-utils/power.d/95hdparm-apm.orig /usr/lib/pm-
utils/power.d/95hdparm-apm
Right after you encounter such a freeze, can you please reboot and
attach /var/log/kern.log?
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Incomplete
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Computer freeze when removing power cable
https://bugs.launchpad.net/bugs/615803
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