I found nothing for apport.log. But this is what I have under apport.log.1:
ERROR: apport (pid 3241) Sat Feb 9 00:32:24 2019: called for pid 1384, signal 11, core limit 0, dump mode 2
ERROR: apport (pid 3241) Sat Feb 9 00:32:24 2019: not creating core for pid with dump mode of 2
ERROR: apport (pid 3241) Sat Feb 9 00:32:24 2019: executable: /usr/sbin/lightdm (command line "lightdm --session-child 13 20")
ERROR: apport (pid 3241) Sat Feb 9 00:32:25 2019: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
ERROR: apport (pid 3241) Sat Feb 9 00:32:25 2019: wrote report /var/crash/_usr_sbin_lightdm.0.crash
Thoughts?