I've just upgraded from Xubuntu 14.10 to 15.04. After rebooting I was presented with a blank screen. Switching to a terminal I could see that lightdm-gtk-greeter was consuming 100%. After that I switched back to the graphical environment. Then I clicked the left-mouse button at a random position and the normal login screen came up and I could log in.
I added the allow-debugging=true option to lightdm-gtk-greeter.conf and restarted. I attached the resulting x-0-greeter-log. After that added the option active-monitor=0 as suggested in one of the comments above. This workaround solves the problem for me. After the reboot the login screen comes up immediately. ** Attachment added: "Greeter log with allow-debugging enabled" https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter/+bug/1410406/+attachment/4383167/+files/x-0-greeter.log.old.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1410406 Title: black screen after booting, 100% cpu usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter/+bug/1410406/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
