First, [[Upgrade Debian Linux to Testing|upgrade to testing]] with ports support. == Limit architectures in repos (optional) == Consider using this source.list file:  cat <<EOF >/etc/apt/sources.list deb [arch=amd64] https://deb.debian.org/debian testing main contrib non-free deb [arch=amd64] https://deb.debian.org/debian-security testing/updates main contrib non-free deb [arch=riscv64] https://deb.debian.org/debian-ports unstable main deb [arch=riscv64] https://deb.debian.org/debian-ports unreleased main deb [arch=riscv64] https://deb.debian.org/debian-ports experimental main EOF == Enable == After you've done the above, then do (as root):