Ubuntu: remove service from automatic startup

I have recently installed a BOINC client on my Ubuntu box. However later on I decided to turn it off but all I could do is to turn off the service and not disable it at the automatic startup.

After some search on the web I found this link - which is in my opinion very helpful: http://www.unixtutorial.org/2009/01/disable-service-startup-in-ubuntu/

Example from my box:

root@ubuntu:~# update-rc.d -f boinc-client remove
 Removing any system startup links for /etc/init.d/boinc-client ...
   /etc/rc0.d/K20boinc-client
   /etc/rc1.d/K20boinc-client
   /etc/rc2.d/S20boinc-client
   /etc/rc3.d/S20boinc-client
   /etc/rc4.d/S20boinc-client
   /etc/rc5.d/S20boinc-client
   /etc/rc6.d/K20boinc-client