Debian Apt Sources
Debian only has three release cycles stable, testing, and unstable.
Make sure to install these:
sudo apt install curl wget apt-transport-https dirmngr
Stable
The "stable" distribution contains the latest officially released distribution of Debian.
#------------------------------------------------------------------------------#
# OFFICIAL DEBIAN REPOS
#------------------------------------------------------------------------------#
###### Debian Main Repos
deb http://cdn-fastly.deb.debian.org/debian/ stable main contrib non-free
deb http://cdn-fastly.deb.debian.org/debian/ stable-updates main contrib non-free
deb http://security.debian.org/ stable/updates main contrib non-free
deb http://ftp.debian.org/debian buster-backports main
deb-src http://cdn-fastly.deb.debian.org/debian/ stable main contrib non-free
deb-src http://cdn-fastly.deb.debian.org/debian/ stable-updates main contrib non-free
deb-src http://security.debian.org/ stable/updates main contrib non-free
deb-src http://ftp.debian.org/debian buster-backports main
Testing
The "testing" distribution contains packages that haven't been accepted into a "stable" release yet, but they are in the queue for that.
#------------------------------------------------------------------------------#
# OFFICIAL DEBIAN REPOS
#------------------------------------------------------------------------------#
###### Debian Main Repos
deb http://deb.debian.org/debian/ testing main contrib non-free
deb-src http://deb.debian.org/debian/ testing main contrib non-free
deb http://deb.debian.org/debian/ testing-updates main contrib non-free
deb-src http://deb.debian.org/debian/ testing-updates main contrib non-free
deb http://deb.debian.org/debian-security testing-security main
deb-src http://deb.debian.org/debian-security testing-security main
Unstable
The "unstable" distribution is where active development of Debian occurs.
#------------------------------------------------------------------------------#
# OFFICIAL DEBIAN REPOS
#------------------------------------------------------------------------------#
###### Debian Main Repos
deb http://deb.debian.org/debian/ unstable main contrib non-free
deb-src http://deb.debian.org/debian/ unstable main contrib non-free
Last update: 2021-11-25