Proxmox – additional Network Configurations

Activate “Proxmox VE No-Subscription Repository”. The File “/etc/apt/sources.list” should be looks like:

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

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

after changed the file run

apt update | apt upgrade | apt install ifupdown2

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