Looking at the apport log file again this looks suspect:
ERROR: apport (pid 2661) Thu Sep 28 06:51:20 2017: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
Looking at the apport log file again this looks suspect:
ERROR: apport (pid 2661) Thu Sep 28 06:51:20 2017: is_closing_ session( ): no DBUS_SESSION_ BUS_ADDRESS in environment