I solved it. The /usr -directory did not have the right permissions. But why the GDM consumes 99% CPU? An error would be helpfull!
-- GDM does not start (black screen and 99% CPU) https://bugs.launchpad.net/bugs/112174 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug contact for gdm in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
