gdm-stop
stop the GNOME Display Manager service
TLDR
Stop GNOME Display Manager
$ sudo gdm-stop
SYNOPSIS
gdm-stop
DESCRIPTION
gdm-stop stops the GNOME Display Manager service entirely, terminating all graphical sessions and shutting down the graphical login interface. The system returns to text console mode (TTY), making this useful for troubleshooting graphics issues, performing system maintenance, or switching to a different display manager.
All logged-in users will be forcibly logged out when GDM stops. On systemd-based systems, this is typically a wrapper for "systemctl stop gdm". After stopping GDM, you can start it again with gdm-start or access text consoles directly.
CAVEATS
Stopping GDM will terminate all graphical sessions. Save your work before running this command.
SEE ALSO
gdm-restart(1), gdm(8)