It looks like you use an nvidia driver for your video card. Could you
try reinstalling the preferred driver using software-properties-gtk?
Thanks!
2015-04-24 11:55:52,829 DEBUG Kernel uname: '3.17.4-031704-generic'
2015-04-24 11:55:52,836 DEBUG nvidiaUpdate()
2015-04-24 11:55:53,857 INFO no old nvidia driver installed, installing no new
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Incomplete
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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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