When we process, it shows :
With this issue, system processes to get a subscription repo without purchase subscription on this server. So it shows an error message for notice unable to get repo source. For fixing this problem you should 1. Remove the subscription repo that had set in
Remove Paid Subscription Repo of Proxmox Enterprise
Access apt list of enterprise repo in Proxmox server by web CLI or SSH.
Add a “#” in front of repo URL to remove it form the list.
# deb https://enterprise.proxmox.com/debian wheezy pve-enterprise
Add Free Non-Subscription Repo of Proxmox Server
Access apt list in Proxmox server by web CLI or SSH.
Add the following command in it.
# PVE pve-no-subscription repository provided by proxmox.com, # NOT recommended for production use deb http://download.proxmox.com/debian/pve stretch pve-no-subscription