gdm for a while as my display manager, and after removing it, lightdm does not start by itself. I instead have to login to a tty, and run
sudo start lightdm.
dpkg-reconfigure lightdm does not work either:
dpkg-maintscript-helper: warning: environment variable DPKG_MAINTSCRIPT_NAME missing dpkg-maintscript-helper: warning: environment variable DPKG_MAINTSCRIPT_PACKAGE missing
I've also tried reinstalling lightdm completely, but it does not work as well
/var/log/boot.log has the following lines:
* Starting LightDM Display Manager * Starting ACPI daemon * Starting anac(h)ronistic cron * Starting save kernel messages * Stopping LightDM Display Manager