Yep, me too (ethernet problem)

[Nyto]

Help!
Since the original installation, I've always been connected via wi-fi on my LL computer.
Today I want to go the ethernet way, but LL is not finding my ethernet connector, wether “eth” or “enp” both are nowhere to be found.
If I type

Code:

ifconfig

it will only acknowledge lo: and wlp1s0:.

Code:

# nmcli dev status

will return this info:
DEVICE  TYPE        STATE          CONNECTION       
wlp1s0    wifi          connected    Nyt0s-W1-F1
lo            loopback unmanaged  --


I tried ifdown/ifup eth0 but the computer still can't find the interface.
A lot of the helpful commands are useless if the machine thinks there's not an interface there, so how could I "activate" the interface first so I can go on and configure it?