Comment 30 for bug 1115053

One could also adjust the scripts to stop. Again, from the man page:
       A common system administration error is to delete the links with the
       thought that this will "disable" the service, i.e., that this will
       prevent the service from being started. However, if all links have
       been deleted then the next time the package is upgraded, the package’s
       postinst script will run update-rc.d again and this will reinstall
       links at their factory default locations. The correct way to disable
       services is to configure the service as stopped in all runlevels in
       which it is started by default. In the System V init system this means
       renaming the service’s symbolic links from S to K.