Public bug reported:

I wanted to test Ubuntu 15.10 from live USB on a MacBook Pro 8,2 with Radeon HD 
6770M.
Currently, the machine has installed Ubuntu 15.04 with Radeon disabled in grub 
and works well. I have installed this booting the live USB of Ubuntu 15.04 
through a 'nomodeset' command in grub options. I'm looking to do the same to 
testing live the 15.10, but it seems not work.

If I boot the USB normally, the boot stopped at [6.9] with "i8042: No 
controller found" issue.
If I boot removing "quite splash" from grub, the boot stopped at [7.3] with 
"fb: switching radeonfmfb from EFI VGA" issue.
If I boot removing "quite splash" and adding "nomodeset" in grub, the boot 
stopped after a couple of minutes on "[ OK ] Started WPA supplicant".

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: 15.10

** Tags added: 15.10

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https://bugs.launchpad.net/bugs/1497905

Title:
  Unable to boot live 15.10 on MacBook Pro 8,2

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