[+3.67s] DEBUG: Got signal 15 from process 939
[+3.67s] DEBUG: Caught Terminated signal, shutting down
So, something is killing lightdm with a signal.
From the PID, and from an 'initctl list' on the same system, it's clear that the signal is coming from some process that has started on runlevel 2 (cron, atd, and acpid all have PIDs of 93x).
The lightdm log shows this:
[+3.67s] DEBUG: Got signal 15 from process 939
[+3.67s] DEBUG: Caught Terminated signal, shutting down
So, something is killing lightdm with a signal.
From the PID, and from an 'initctl list' on the same system, it's clear that the signal is coming from some process that has started on runlevel 2 (cron, atd, and acpid all have PIDs of 93x).