Under Debian Linux startup files are stored in /etc/init.d/ directory.

Debian uses scripts to start services at boot time from /etc/init.d/ directory.

I will show two ways with which you can remove unwanted startup files or services:

Firts is rcconf :

Rcconf gets a list of services from /etc/init.d and looks in the /etc/rc?.d directories to determine whether each service is on or off.

Installation:

apt-get install rccconf

Usage:

Just type rcconf in console and use space key to remove the desired service.

The second is update-rc.d script:

You can use update-rc.d script as follows to remove any links in the /etc/init.d/:

update-rc.d -f {service name desired} remove

Example:

To stop apache2 service at boot time we will use :

update-rc.d -f apache2 remove