If you need to setup/install Debian. Please follow this post.

1. Removing a service from startup

# update-rc.d -f samba remove

2. Installing a service on boot
update-rc.d myServiceName start 80 2 3 4 5 . stop 15 0 1 6

3. Specifying Debian Sources
#vim /etc/apt/sources.list
#SID:
deb http://debian.cn99.com/debian unstable main
deb-src http://debian.cn99.com/debian unstable main

#LENNY:
#deb http://debian.cn99.com/debian testing main
#deb-src http://debian.cn99.com/debian testing main

#ETCH
#deb http://debian.cn99.com/debian etch main
#deb-src http://debian.cn99.com/debian etch main

4. Searching for a package from the repository

apt-cache search [package name]

5. Installing a package

apt-get install [package name]

6. Purging an installed/configured package

aptitude purge [package name]

7. Upgrade a debian distro

apt-get dist-upgrade