cat openvpn-repo-pkg-key.pub | sudo gpg --no-default-keyring --keyring gnupg-ring:/etc/apt/trusted.gpg.d/as-repo-public.gpg --import
deb http://ftp.ru.debian.org/debian bullseye main contrib
deb http://ftp.ru.debian.org/debian bullseye-updates main contrib
deb http://security.debian.org bullseye-security main contrib
deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription
вот команда со скачкой: я привел пример уже оффлайн установки.