Ubuntu 16.04.02 Hang on Reboot or Shutdown

Had a problem after an update that when I force a restart or a shutdown on my server, it hangs on the last part of the process.

To fix my problem, I had to edit the /etc/default/grub config file and added acpi=force apm=power_off to the config line, between the double quotation marks…

1
GRUB_CMDLINE_LINUX_DEFAULT=""

and

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GRUB_CMDLINE_LINUX=""

do a update-grub after saving then reboot one more time.. ( force sa restart when it hangs )
After the restart, try another reboot, it should work now without hanging.

Source of the fix is from Here

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