This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1617599

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1617599

Title:
  Resume from suspend causes reboot, except if USB key is plugged in

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have been struggling to find out how to get my laptop (Dell M3800)
  using ubuntu 16.04 to resume from suspend. It goes into suspend (with
  no errors in /var/log/pm-suspend.log). But when resuming, it
  immediately reboots, with no errors in /var/log/pm-suspend either.

  *but*

  Resume works perfectly when a USB key is plugged in (any key!).

  PS: I figured that out because suspend/resume works out of the box
  when using ubuntu 16.04 live CD, but not when using the fresh
  installed 16.04 afterwards. What's the difference?? There's a key in
  the USB port in the first case. So I tried suspend/resume with the
  *installed* version when a USB key is present: it works.

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