Pérdida de conección lan por puerto de red eth despues de configurar wifi en raspberri 3 b +

Today in my new RPPi 3B+ with openhab runing I configured the wifi without problem, but I lost the ethernet lan conecction.
Solution:
Create a new plain file in /etc/network/interfaces.d folder. Inside of the new file (does not the matter the name) I define the lost interface:
auto eth0
iface eth0 inet dhcp

reboot
and thats all

Step by step, what I did:

1. ssh openhabian@openhabianpi
2. sudo nano /etc/network/interfaces.d/ethnew
3. write two lines:
   auto eth0
   iface eth0 inet dhcp
4. save file (ctr + o), exit file (ctr +x)
5. sudo shutdown now -r

Link al foro donde está la solución publicada.