How To Change The Default Display Manager (Switch To GDM, LightDM, SDDM, Or LXDM) In Debian, Ubuntu Or Linux Mint view page
Fedora Switch Display Manager – GDM / SDDM / LXDM / LightDM / KDM / XDM view page
Login Screen view page
Ubuntu default lightdm view page
lightdm greeter themes arch view page