I had same problem in Kubuntu. nvidia-prime chages /etc/lightdm/lightdm.conf greeter parameter to unity-greeter. This change prevents lightdm starting. To fix it i had to change greeter back to lightdm-kde-greeter.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1224098 Title: xserver wont start after nvidia-prime installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1224098/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
