On Tue, 26 Sep 2017 18:03:32 +0200
"R. G. Sidler" <rgsidler@???> wrote:

> Replace the entry for ethernet in your /etc/network/interfaces with
> just auto eth0 (vor whatever Name your device has). Sign off and sign
> in again. You should now be able to connect to your LAN.


Its sufficient to toggle the "managed=false" line in the "ifupdown"
section of /etc/NetworkManager/NetworkManager.conf to "true".

libre Grüße,

Florian