This has worked in my case: http://vxlabs.com/2015/02/05/solving-the- ubuntu-14-04-nvidia-346-nvidia-prime-black-screen-issue/
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1447978 Title: After update from 14.10 to 15.04 boot stops at black screen displaying "Starting version 219" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1447978/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
