Free Package Updates
If you use proxmox for free, you will need to configure proxmox for updates. For this you will install the apt repository for unstable updates.
Edit /etc/apt/sources.list
Edit the /etc/apt/sources.list file to add the no-subscription repository as below.
/etc/apt/sources.list
deb http://ftp.nz.debian.org/debian bullseye main contrib
deb http://ftp.nz.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
Edit /etc/apt/sources.list.d/pve-enterprise.list
Comment out the line in that file, you should then have.
/etc/apt/sources.list
#deb https://enterprise.proxmox.com/debian/pve bullseye pve-enterprise
Update
> sudo apt-get update && sudo-apt-get dist-upgrade