Yo quitaria GDM o el de turno del arranque, de esa forma te queda el entorno por si mas adelante te arrepientes.
Código:
# update-rc.d -f gdm3 remove
Si lo que tienes es Gnome puedes quitarlo así:
Código:
# apt-get autoremove --purge gnome*
En línea
The fact is, even if you were to stop bombing us, imprisoning us, torturing us, vilifying us, and usurping our lands, we would continue to hate you because our primary reason for hating you will not cease to exist until you embrace Islam.