Switched to Ubuntu 18 build to get around this issue.

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https://bugs.launchpad.net/bugs/1894914

Title:
  Ubuntu 16.04 HWE Kernel Fails to Shutdown/Reboot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Running embedded hardware.  After updates, the system hangs on reboot
  (and shutdown).

  This system has run various levels of Ubuntu 16.04 LTS and Ubuntu
  16.04 LTS with HWE Kernel.  This is the first major problem
  encountered.

  The system hangs on 'Reached Target Shutdown' with Kernels linux-
  image-4.15.0-106-generic and linux-image-4.15.0-115-generic.
  Installed and booted with linux-image-4.15.0-96-generic on the system
  allows successful reboot.

  In an attempt to bypass the issue, I tested all values for kernel
  parameter reboot= with no success.  I also forced acpi on/off and
  tested setting noefi.  None of these changes corrected the problem.

  Description:    Ubuntu 16.04.7 LTS
  Release:        16.04

  Ubuntu 4.15.0-115.116~16.04.1-generic 4.15.18

  Installed Kernels (96 => Success, 115 => Fail)
  ii  linux-image-4.15.0-115-generic         4.15.0-115.116~16.04.1  
  ii  linux-image-4.15.0-96-generic          4.15.0-96.97~16.04.1

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