Enable Proxmox No-subscription Repository

You don’t need a license key to use the Proxmox No-subscription repository. It is suitable for home labs users, testing purpose and non-production use.

To enable Proxmox No-subscription repository, edit /etc/apt/sources.list file:

# nano /etc/apt/sources.list

And add the following lines:

deb http://ftp.debian.org/debian bullseye main contrib

deb http://ftp.debian.org/debian bullseye-updates main contrib

# security updates
deb http://security.debian.org bullseye-security main contrib

# PVE pve-no-subscription repository provided by proxmox.com,
# NOT recommended for production use
deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription

Finally, update the repository list:

$ sudo apt update

$ apt full-upgrade