1.3.2. Add No-Subscription Proxmox Repository

You’ll need to edit the sources.list file for apt

$ nano /etc/apt/sources.list

deb http://ftp.debian.org/debian stretch main contrib

# 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

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

$ apt-get update -y

Note

Do not forget to add the apt cache configuration if you’re in a Proxi-ed network

  • Acquire::http:Proxy “http://aptcacher.domain.tld:3142”;

OR

  • Acquire::http:Proxy “http://proxy.domain.tld:port”;

Source: * Official Proxmox VE Site - Package Repositories