It seems that this (https://bugs.launchpad.net/ubuntu/+source/xorg- server/+bug/459639/comments/53) solved both problems (1) X server starts randomly in failsafe when starting from cold boot and (2) boot hangs on splash screen.
-- boot hangs on splash screen, does not show kdm https://bugs.launchpad.net/bugs/578732 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kdebase-workspace in ubuntu. -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs