Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1842965

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

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