/etc/apt/sources.list

deb http://deb.debian.org/debian buster main non-free contrib
deb-src http://deb.debian.org/debian buster main non-free contrib

deb http://deb.debian.org/debian/ buster-updates main contrib non-free
deb-src http://deb.debian.org/debian/ buster-updates main contrib non-free

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

depois rodar apt update
apt install joe -y