Wie kann ich Proxmox updaten ohne Subscription?

Ich habe mir bereits die Seite im Wiki angeschaut und auch einige Yt Videos.

https://pve.proxmox.com/wiki/Package_Repositories

https://www.youtube.com/watch?v=qrnxQ3jEbgg

meine "Fehlermeldung":

root@server:/etc/apt# apt-get update
Err:1 http://ftp.de.debian.org/debian buster InRelease
 Temporary failure resolving 'ftp.de.debian.org'
Err:2 http://ftp.de.debian.org/debian buster-updates InRelease
 Temporary failure resolving 'ftp.de.debian.org'
Err:3 http://security.debian.org buster/updates InRelease
 Temporary failure resolving 'security.debian.org'
Err:4 http://download.proxmox.com/debian/pve buster InRelease
 Temporary failure resolving 'download.proxmox.com'
Reading package lists... Done
W: Failed to fetch http://ftp.de.debian.org/debian/dists/buster/InRelease Temporary failure resolving 'ftp.de.debian.org'
W: Failed to fetch http://ftp.de.debian.org/debian/dists/buster-updates/InRelease Temporary failure resolving 'ftp.de.debian.org'
W: Failed to fetch http://security.debian.org/dists/buster/updates/InRelease Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://download.proxmox.com/debian/pve/dists/buster/InRelease Temporary failure resolving 'download.proxmox.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

meine /etc/apt/sources.list:

deb http://ftp.de.debian.org/debian buster main contrib
deb http://ftp.de.debian.org/debian buster-updates main contrib
# security updates
deb http://security.debian.org buster/updates main contrib

meine /etc/apt/sources.list.d/pve-community.list:

 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