Install ldm by entering the following commands in the terminal:
sudo apt update sudo apt install ldm
Description:
LTSP display manager
ldm is an X11 display manager similar to xdm, gdm and kdm, but unlike those it wraps the X11 traffic within an SSH tunnel to provide a secure login mechanism for remote X sessions. . LTSP stands for 'Linux Terminal Server Project'.
Homepage: http://ltsp.org/
Version: 2:2.2.19-1
Section: universe/misc