How to connect Ubuntu 18.04 desktops through ethernet cable

项目场景：

Build up connections among multiple Ubuntu 18.04 desktops through the Ethernet connection.

问题描述

It is a very common problem, but somehow I just forgot the solution. This report is a reminder of mine.

解决方案：

https://askubuntu.com/questions/1104506/share-wireless-internet-connection-through-ethernet-on-18-04-lts
Key command is:
nm-connection-editor