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[broadcast23 <1568211@xxxxxxxxxxxxxxxxxx>]

I have an A8 3820 AMD cpu (HD 6550 graphics) I have the same problem.
First I want to say that I have been booting a usb hdd since 16.04
alpha. when I booted kernal 4.4.0-10 no problem, but I then booted to
4.4.0-12 that's when the problem started. Then I waited for the release
of 16.04, there was no change. I just booted the live dvd using nomodset
option and the screen showed an error "no ums support on radeon module."
I don't have any other driver installed except what's in the kernel.

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https://bugs.launchpad.net/bugs/1568211

Title:
  no UMS support in radeon module

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I upgraded overnight from Wily to Xenial. The system will not boot.
  Only a blank screen after grub loads the kernel.

  The recovery kernel loads fine and I was able to find the following
  messages:

  [drm] VGACON disable radeon kernel modesetting
  [drm:radeon_init [radeon]] *ERROR* no UMS support in radeon module!

  The recovery kernel command line had a nomodeset parameter that was
  not in the main kernel command line.

  Adding the nomodeset parameter the main kernel command line finally
  booted the system. It's kind of ugly but it seems to work.

  Note: For what it's worth I reported a similar issue against several
  Utopic kernels (bug #1407505). There was a back and forth with
  jsalisbury until a kernel finally worked. I have had no problems until
  today.

  Hope that helps.

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