[Bug 36158] Re: System does not power off on shutdown

[Sitsofe Wheeler]

It is quite possible that Bug #33775 is related to this one.

A large number of these problems may revolve around buggy bios that a
crashing when they are told to power off. If at all possible check
whether there is a newer BIOS for your motherboard (of course flashing
your BIOS is done at your own risk etc.)

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System does not power off on shutdown
https://launchpad.net/bugs/36158