ProxMox is an open source, free Linux Distro, that gives you enterprise grade VMWARE virtualisation features either free of charge. The product itself is free. The support isnt free. If you want to run proxmox in your enterprise and want it to be backed up with enterprise grade support, consider a subscription!
Those who dont need direct vendor support or cant afford it still can use proxmox, but require to change some apt configurations and will have to live with a higher risk of breaking, since the “free update repositories” are more “on the edge”.
This method is no a hack and is officially described at on their wiki page:
This is how i did it:
mv -v /etc/apt/sources.list.d/pve-enterprise.list{,.DISABLED}
cat << EOF > /etc/apt/sources.list.d/pve-no-subs.list # according to ... # https://pve.proxmox.com/wiki/Package_Repositories # # PVE pve-no-subscription repository provided by proxmox.com, # NOT recommended for production use deb http://download.proxmox.com/debian/pve buster pve-no-subscription EOF
apt update && apt dist-upgrade -yy && reboot