> 2016-11-02 12:25 GMT+01:00 Uwe Brauer <oub.oub.oub@...>:

   > Hello,
   > I'm using Debian, so it could be different for you.
   > But you have to comment your eth0 lines on your file /etc/network/interfaces.

Hm thanks.

I renamed that file to interface-org, maybe this is not sufficient.
Are you saying I should comment out *all* lines concerning eth0? Even
auto eth0?

I have right now in the file interface-org

auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

iface eth0 inet static
address XXX.XX.XX.XX
netmask 255.255.255.0
gateway XXX.XX.XX.XX

auto eth0

Where I put in this mail dummy values for the relevant entries.


   > And you have to change the bolean of ifup line on the file
   > /etc/Networkmanager/Networkmanager.conf
   > Try to do it an reboot ?


There is no [ifup] line only a [ifupdown] line

So should I change 

[ifupdown]
managed=false


To 
[ifupdown]
managed=true

And just in case

[ifup]
managed=true