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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