# deb http://mirror.yandex.ru/debian buster main deb-src http://mirror.yandex.ru/debian buster main deb http://mirror.yandex.ru/debian buster-updates main deb-src http://mirror.yandex.ru/debian buster-updates main deb http://security.debian.org/ buster/updates main deb-src http://security.debian.org/ buster/updates main deb http://deb.debian.org/debian/ buster-backports main contrib non-free deb-src http://deb.debian.org/debian/ buster-backports main contrib non-free