Install lightdm by entering the following commands in the terminal:
sudo apt update sudo apt install lightdm
Description:
Display Manager
LightDM is a X display manager that: * Has a lightweight codebase * Is standards compliant (PAM, ConsoleKit, etc) * Has a well defined interface between the server and user interface * Cross-desktop (greeters can be written in any toolkit)
Homepage: https://launchpad.net/lightdm
Version: 1.26.0-0ubuntu1
Section: universe/x11