Stop GDM from starting at boot
You need to change your run level or change the services that is executed
for that runlevel, see below.
- Runlevel 0 is halt.
- Runlevel 1 is single-user.
- Runlevels 2-5 are multi-user.
- Runlevel 6 is reboot.
First open /etc/inittab and look for the default runlevel.
# The default runlevel. id:2:initdefault:
It’s 2 in this case.
Next go to ‘/etc/rc2.d’ there you will see a symbolic link to gdm,
Remove S99gdm and you system will not boot into X