Display manager

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:

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

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