ubuntu 20.04 wired network setting is missing
Solution 1:
it seems there is bug about this issue and it is common. by the following the wired network setting returned.$ sudo nmcli networking off$ sudo nmcli networking on
no other network reset commands worked for me and only these ones worked in my case. and yet there was another problem. I had no IP at all! no dynamic and no static. so manually I set a static IP and could get back online.