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 1842965

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/1842965

Title:
  Unable to boot kernel 4.15 on MacPro5,1 (mid 2012)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  System: Mac Pro 5,1 (mid-2012).

  I'm unable to boot the Ubuntu 18.04 installer ISO on this system
  (tried both 18.04.0 and 18.04.3).  I was able to boot the 16.04.1 ISO
  (but NOT 16.04.6) and installed 16.04 successfully.  Then, I upgraded
  to 18.04.  However, when trying to boot the new kernel (4.15.0-60), it
  just locks up at the purple screen.  Booting back to 4.4.0-161 works.

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