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[Tomdkat <1568211@xxxxxxxxxxxxxxxxxx>]

ok, will do.  Should I boot from the 16.04 liveDVD, with "nomodeset"
specified, and run the "ubuntu-bug linux" command?

Thanks!

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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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