I've had a very similar experience with the upgrade to 15.04. I've just
completed nearly 24hours of troubleshooting.  I got around my NVIDIA
problems here after a fresh install of 14.10 and some advice I found
here that helped. http://ubuntuforums.org/showthread.php?t=2263316 see
also my additional steps at comment #7

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https://bugs.launchpad.net/bugs/1447978

Title:
  After update from 14.10 to 15.04 boot stops at black screen displaying
  "Starting version 219"

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