Quelle: cockpit-project.org
Create a placeholder file and network interface.
Create /etc/NetworkManager/conf.d/10-globally-managed-devices.conf with the contents:
[keyfile]
unmanaged-devices=none
Set up a “dummy” network interface:
nmcli con add type dummy con-name fake ifname fake0 ip4 1.2.3.4/24 gw4 1.2.3.1
Reboot