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On Debian Bookworm
Follow Install Proxmox VE on Debian 12 Bookworm
What is missing:
apt install dnsmasq
WARN: missing 'source /etc/network/interfaces.d/sdn' directive for SDN support!
It seems like you have automatic DHCP active, but no gateway configured in the subnet.
- /etc/network/interfaces
source /etc/network/interfaces.d/*