## Main Debian archives.
deb https://deb.debian.org/debian stable main contrib non-free
deb-src https://deb.debian.org/debian stable main contrib non-free

## Debian Security
deb http://security.debian.org/ stable/updates main contrib non-free
deb-src http://security.debian.org/ stable/updates main contrib non-free

## Debian Backports
deb https://deb.debian.org/debian stable-backports main contrib non-free
deb-src https://deb.debian.org/debian stable-backports main contrib non-free