In the edit dialog, switch to the “IPV4 Settings” tab.In the “Network Connections” dialog, edit the wired connection.Open a terminal and run nm-connection-editor.cannot share wired network connection in 18.04 has the correct information for 18.04. I found Sharing Connection to other PCs (Via Wired Ethernet) is very useful but some dialogs have changed in 18.04. My next step is to share internet from Ubuntu notebook through its built-in Ethernet and WiFi. The Ubuntu identify it in “Ethernet Connected” → “Wired connection 2” immediately. I connect it to Ubuntu via a USB cable and enable the USB Tethering in Android. I have an Android with 4G Internet access.
