Why is the Edit button greyed out in Network Manager?
One quick work-around is to invoke the connection editor manually from the command line:
nm-connection-editor
You'll get the same familiar edit screen. Worked for me.
Try this fix-for-error-network-device-not i think you got the similar problem as me.
Summary from linked content:
Run in terminal
sudo /etc/init.d/networking restartEdit file
/etc/NetworkManager/NetworkManager.confChange
managed=falsetomanaged=true-
Run:
sudo killall NetworkManager Now attempt to configure your interface.