I wanted to install the mint version of lightdm-greeter and stumbled upon this topic here: https://forum.antergos.com/topic/8809/option-to-choose-greeter/4
I installed https://aur.archlinux.org/packages/lightdm-slick-greeter/ from the AUR and then changed the greeter-session to be “lightdm-slick-greeter” in /etc/lightdm/lightdm.conf, then rebooted.
While booting it said lightdm couldn’t start or create a session, so I had to roll back that change, but what did I do wrong? or is antergos not compatible with mints greeter?