The same happened to me. I did the upgrade 15.10->16.04 while my laptop was 
docked into the "HP 2013 UltraSlim-Dockingstation" and at some point during the 
upgrade my screen went black and so I decided to reboot. And from this point on 
I could not get my 16.04 system working anymore so I decided to do a 16.04 
installation from scratch. Now I can at least work on my laptop standalone but 
as soon as I try to dock I get the exception in syslog shown above. The weird 
thing is that in the Display Manager dialog my external Acer Monitor is 
detected but no output gets displayed.
One further "famous" error I get in syslog is: "radeon 0000:03:00.0: VCE init 
error (-110)" - so hopefully this gets solved as well with the upgrade.
Will try the kernel upgrade asap.

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https://bugs.launchpad.net/bugs/1573648

Title:
  16.04 -> AMD APU via VGA gives blank screen

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