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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