I just started working for the first time ever.

Not sure if it is a kernel upgrade that did the trick, but it is now running 
the following kernel:
Linux hostname 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:42:33 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

Suspend works, and shutdown works! :)

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  Cannot power down system

Status in linux package in Ubuntu:

Bug description:
  I cannot do a shutdown of the system. It never turns off my computer.

  If I track the shutdown process, it ends with:
  System: Power down

  And then nothing happends except for the internal fans normally speeds
  up, but it does not turn off the PC.

  I can do a reboot without problems.

  I tried the dev kernel version 4.8.0 (amd64) but it did not solve the

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-31-generic 4.4.0-31.50
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  bfk        5288 F.... pulseaudio
   /dev/snd/controlC1:  bfk        5288 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Aug 15 14:22:07 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=1d553aaa-5506-4fdd-b6e4-2da0c11fb7f8
  InstallationDate: Installed on 2016-03-10 (157 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
  MachineType: Apple Inc. MacBookPro11,5
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed 
root=UUID=980d5758-068c-4c32-8f18-ac0d9c15855b ro quiet splash acpi=force 
   linux-restricted-modules-4.4.0-31-generic N/A
   linux-backports-modules-4.4.0-31-generic  N/A
   linux-firmware                            1.157.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/02/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP114.88Z.0172.B06.1509021656
  dmi.board.name: Mac-06F11F11946D27C5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,5
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-06F11F11946D27C5
  dmi.product.name: MacBookPro11,5
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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