Ubuntu Network Manager Not Showing Wired Connection. For example i’m unable to enable remote desktop most likely due to “no networks selected for sharing” message. To check and configure connection:
Tested on ubuntu 16.04 lts. Enter a connection name like manual ethernet click on the ipv4. To save the current status of network interface:

Save, stop and start network manager: I'm almost ready to revert to 16.04 And yet there was another problem.
$ Sudo Nmcli Networking Off.
I'm almost ready to revert to 16.04 You are reading a sample chapter from ubuntu 20.04 essentials. Ok, after days of searching on google, i just found the solution: The installation went well, i can login and etc. The most likely problem here is that the ethernet connection isn't connected to anything that can see the dhcp server.
Right Click On The Network Manager Applet And Choose Edit Connections. In The Wired Tab, Click The Add Button.
Tested on ubuntu 16.04 lts. [ log in to get rid of this advertisement] i have installed ubuntu 20.4 on a new build with the msi z490 motherboard but the wired ethernet is not working. Wired unmanaged in ubuntu 19.04 server. Ubuntu 20.4.1 no wired ethernet. Network manager does not work anymore after upgrade from 18.04 to 20.04.

Network manager does not work anymore after upgrade from 18.04 to 20.04. To save the current status of network interface: And yet there was another problem.
Ok, After Days Of Searching On Google, I Just Found The Solution:
On ubuntu desktop 14.10 or earlier, a dedcated gui program called networ kmanager is responsible for configuring network settings. Any help would be appreciated. Save, stop and start network manager: Buy the full book now in ebook ($14.99) or print ($36.99) format. I have installed a gnome desktop on my ubuntu 18.04 server.
It Looks Like It Tries To Connect To Lan Wired Connection But Then Goes Directly To Wifi And Connects, Then Doesn't Show Any Ethernet Connection Like It Did In 16.04.
By the following the wired network setting returned. The ouput should be somthing like. Now network manager should come up with a connected interface. It seems there is bug about this issue and it is common. Wired unmanaged in ubuntu 19.04 server.