I have bought a new Asus Vivo Book pro, and I have the same problem.
In the beginning I couldn't install Ubuntu 16.04 at all. I could do that by
changing acpi=off in the grub file to get over the problem. The installation
was always stuck at "Preparation for install".
Now after installing the Ubunut 16.04 it takes more than a minute to reboot of
shutdown ! I hope this will be fixed soon!
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Poweroff or reboot hangs. Laptop won't shutdown. 16.04
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