It seems this bug is fixed in the mainline kernel, since I installed
Kernel 4.15, the problem did not reappear again.

** Tags added: kernel-fixed-upstream

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https://bugs.launchpad.net/bugs/1745814

Title:
  Kubuntu crashes repeatedly without error notices

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Since about two weeks my system has repeatedly crashed completely
  without any error notice. The screen freezes and no keys respond. I
  have to shut down the computer pushing the button to turn it on for a
  couple of seconds. On reboot, I usually get the error message

  PXE-E61: Media test failure, check cable
  PXE-M0F: Exiting Intel Boot Agent

  But usually Kubuntu boots after that without problems. Sometimes I
  have to Ctrl+Alt+Del to get boot going.

  I have no idea what causes the crash, it happens suddenly and without
  any hint about what triggers it. I attach the content of
  /var/log/syslog right before the crash from a couple of times it
  happened.

  I am running Kubuntu 16.04.3 LTS with Kernel 4.13.0-31 on a ThinkPad
  T460s.

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