curl -s https://as-repository.openvpn.net/as-repo-public.gpg | sudo gpg --no-default-keyring --keyring gnupg-ring:/etc/apt/trusted.gpg.d/as-repo-public.gpg --import
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
я думаю gpg взять отсюда
https://ftp.debian.org/debian/dists/Debian10.12/