debian-default-sources.list

deb http://httpredir.debian.org/debian __CODENAME__ main contrib non-free
#deb-src http://httpredir.debian.org/debian __CODENAME__ main contrib non-free

deb http://httpredir.debian.org/debian __CODENAME__-updates main contrib non-free
#deb-src http://httpredir.debian.org/debian __CODENAME__-updates main contrib non-free

deb http://httpredir.debian.org/debian __CODENAME__-backports main contrib non-free
#deb-src http://httpredir.debian.org/debian __CODENAME__-backports main contrib non-free

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