# buster - oficiales 
deb http://ftp.es.debian.org/debian/ buster main contrib non-free
deb-src http://ftp.es.debian.org/debian/ buster main contrib non-free

# buster - actualizaciones de seguridad
deb http://security.debian.org/debian-security buster/updates main contrib non-free
deb-src http://security.debian.org/debian-security buster/updates main contrib non-free

# buster - actualizaciones
deb http://ftp.es.debian.org/debian/ buster-updates main contrib non-free
deb-src http://ftp.es.debian.org/debian/ buster-updates main contrib non-free