Proxmox PVE APT UPDATE "not authorized" Error Message - How to configure No-Subscription APT Repository

Proxmox PVE is a great software and mature Virtualization Environment.  I am very thankful for the team and grateful for the software. I wish I can afford to pay for subscription, but so far I am not that much profitable yet. Because of that I am still not a subscriber :-(    However I plan to be and recommend anyone who can to subscribe.

Having said the above, I would like to show you what steps are necessary to disable Enterprise Repository and Enable the No-Subscription Repository.  This is for the New Proxmox PVE 6.x using Debian Buster.

STEP 1 - ADD NO-SUBSCRIPTION REPOSITORY

nano /etc/apt/sources.list

Add the following lines at the end of your /etc/apt/sources.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

Your new sources.list file should now look like this:

deb http://ftp.us.debian.org/debian buster main contrib

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

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

# 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

STEP 2 - COMMENT OUT THE ENTERPRISE REPOSITORY FILE

nano /etc/apt/sources.list.d/pve-enterprise.list

Put a pound sign in front of this line:

# deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise

Your pve-enterprise.list file should now look like this:

# deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise

STEP 3 - TEST BY EXECUTING APT UPDATE

You should now be able to execute 'apt update' without errors.

# deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise

STEP 3 - CONGRATULATIONS! YOU CAN NOW UPDATE FROM PROXMOX

Remember to Subscribe to Proxmox when you can!