Actually, looking at the extracted log from #2, I believe I misremembered and the file it did not know how to handle was /etc/alternatives/lxdm.conf, not /etc/default/lxdm.conf.
Actually, looking at the extracted log from #2, I believe I misremembered and the file it did not know how to handle was /etc/alternativ es/lxdm. conf, not /etc/default/ lxdm.conf.