Does the machine power off correctly if you close all your applications,
and then do

  sync; sudo poweroff -f

This will directly tell the kernel to power off, without any userspace
action in between. Hence the closing of applications and "sync" to write
any outstanding data to the disk. You will also get an fsck on the next
boot.

If that still does not power off the machine, this is a kernel problem
(which I suspect as you get to the "powering off" line).

Thanks!

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https://bugs.launchpad.net/bugs/1578015

Title:
  Yet another system hangs at shutdown (16.04)

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