apt-cdrom is a simple command to add CDROMs to apt's sources.list file. Its syntax is a variation on this basic command line
apt-setup is an interactive program that simplifies adding sources to apt's sources.list. It knows about all the major debian mirrors and can help you select one. It can even use apt-cdrom to scan CDs.
debconf is a software utility for performing system-wide configuration tasks on Unix-like operating systems. It is developed for the Debian GNU/Linux distribution, and is closely integrated with Debian's package management system, dpkg.
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apt-mirror is a small tool that provides ability to mirror any parts (or even all) of Debian GNU/Linux distribution or any other apt sources which often provided by many debian developers.
Using sources.list file
If you want to add repositories for ubuntu you need to add in /etc/apt/sources.list file before adding any new repositories take backup of this file and add more repositories.
#cp -p /etc/apt/sources.list /etc/apt/sources.list_backup
