Network-Manager

[Goran]

I'm booting a 18.04-Server image, which was installed via debootstrap. All fine.

Further I installed network-manager to use is at the command prompt.

My goal is to boot any server and connect via any ethernetcard I plug
a cable into.

When I invoke

nmcli device status

I get an

enp9s0 ethernet unmanaged ---

So I went to /etc/network due to disable the interfaces file. But there is none.

What else can I do?

Regards