{wiki}

Check which you you have:
``
systemctl status display-manager.service
``
Tested on <Ubuntu 23.10> I see:
``
● gdm.service - GNOME Display Manager
     Loaded: loaded (/lib/systemd/system/gdm.service; static)
     Active: active (running) since Sun 2023-12-24 10:34:50 GMT; 23min ago
    Process: 1827 ExecStartPre=/usr/share/gdm/generate-config (code=exited, status=0/SUCCESS)
   Main PID: 1850 (gdm3)
      Tasks: 4 (limit: 71817)
     Memory: 6.8M
        CPU: 119ms
     CGroup: /system.slice/gdm.service
             └─1850 /usr/sbin/gdm3
``
which means I have <GNOME Display Manager>.

Bibliography:
* https://unix.stackexchange.com/questions/20370/is-there-a-simple-linux-command-that-will-tell-me-what-my-display-manager-is
* https://askubuntu.com/questions/584373/how-to-check-using-the-command-line-which-display-manager-is-running


 Source: cirosantilli/display-manager