First of all, I'm working with Ubuntu Server 18.04, on a Raspberry Pi 3b+.
I'm running a server with Nodejs and MongoDB. Everything works perfect. The problem comes when I want to clone the SD into another, in order to not have to repeat all the process in the new SD. However, when I do it, the clone (new) system has ethernet problems. For example, when I do
eth0 does not appear, unlike in the original image. For what I've read, it seems to be a problem with the MAC address, but I don't know how to solve it. Is there any way to make a clone in a proper way without losing the ethernet connection? Thanks