I have the same issue. It seems like a X server crash left the stale lock file around. (I'm using Option "NoTrapSignals" "true" in xorg.conf, so apport gets to know about the X server crashes).
I have the same issue. It seems like a X server crash left the stale lock file around. (I'm using Option "NoTrapSignals" "true" in xorg.conf, so apport gets to know about the X server crashes).