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[BeenD <1568211@xxxxxxxxxxxxxxxxxx>]

Don't misunderstand - I had the same error as you guys and I've thought
that the problem is my Radeon HD4250 onboard graphics card. For me it
seems to be that the reason is the IDE driver. Please check and confirm
- thank you.

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

Title:
  Unable to boot

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.

  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.

  WORKAROUND: Adding the nomodeset parameter the main kernel command
  line finally booted the system.

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