update-rc.d is what is generally used on Debian/Ubuntu systems to manage services. You may want to look up information on Linux run levels, and also read the man page for that command.
To disable autologin:
In /etc/gdm/gdm.conf, make sure you have these lines:
Quote:
AutomaticLoginEnable=false
AutomaticLogin=
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Linux/UNIX family systems do not have "registries," so to speak. The equivalent would be the conf files in /etc and ~/.