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

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