This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1741167

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/1741167

Title:
  Mainline kernel 4.14.11 not booting on Lenovo X220

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  With Ubuntu 16.04.3 LTS (Xenial Xerus), Ubuntu mainline kernel 4.14.10
  or 4.14.11 for arch i386 does not boot on Lenovo Thinkpad X220. After
  GRUB message 'loading initrd' screen is cleared and machine restarts
  BIOS. Nothing is written to screen or system log.

  Mainline kernels up to 4.14.9 for arch i386 works fine.

  Booting same machine with mainline kernel 4.14.11 for arch amd64 works
  fine.

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