I found that it is the nvidia card that causes it, if you install nvida- prime then type sudo prime-select intel or open nvidia-settings and switch to intel it boots up fine... Also if you update with proposed it doesn't get a black screen but compiz doesn't load.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-prime in Ubuntu. https://bugs.launchpad.net/bugs/1283353 Title: System ends with black screen after latest update Status in “nvidia-prime” package in Ubuntu: Confirmed Bug description: After latest update on Kubuntu 14.04 system ends with black screen just when login screen should shows up. Lightdm or kdm doesn't work. Removing nvidia-prime results with normal booting. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1283353/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
