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.
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.