Your Debian / Ubuntu Linux box security depends upon access to system services (one of many aspects). However, if you do not need use a service, you should always turn off all unused services to avoid exploits.
Read more about it here
Under Red hat and Centos Linux you can use chkconfig command (ntsysv command) to configure Sys V style init script links. There is also service command to stop / start / restart services.
So if you are addicted to the service command under RHEL / CentOS / Mandriva Linux and have wondered what to do in Debian / Ubuntu, Linux try sysvconfig package.