Public bug reported:

Hardware: Mac Pro 5,1 (mid-2013)
Platform: Ubuntu 16.04 LTS Server
Details of Issue: 

Though Ubuntu 16.04 LTS Server successfully installs, upon boot it
stalls on trying to utilize the radeon driver. Specifically the boot
process stalls with the following message displayed:

fb: switching to radeondrmfb from EFI VGA

This is ignored when one boots ubuntu into recovery mode then selects
resume from the menu as it skips some normal checks before continuing
the boot process. Additionally, if one modified the grub boot options
and sets to boot the kernel with "nomodeset" and then blacklist the
driver, the entire issue is avoided and the machine boots as normal.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1592466

Title:
  Ubuntu 16.04 LTS stalls during boot

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