Proxmox without a subscription

If you're running Proxmox without a subscription (for testing or personal use) you should make these repo changes to prevent errors

SSH in to the Proxmox server and make the following modifications to source lists

nano /etc/apt/sources.list

Add the line at the end of the file

deb http://download.proxmox.com/debian jessie pve-no-subscription

Now remove (or comment out) the enterprise repo

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

#<-add this deb https://enterprise.proxmox.com/debian jessie pve-enterprise

Now update the system

apt-get update

apt-get dist-upgrade