I am actually wondering how to prevent services (in this case the X server) in Ubuntu (14.04) from startup automatically at boot time. I tried:
sudo update-rc.d lightdm remove
sudo update-rc.d lightdm stop 2 3 4 5
but the session managager starts up nevertheless. What piece of Ubuntus startup system I have to work with in order to do the job?
Thanks for your help!