Solve the problem that ubuntu16.04 802-1x cannot save passwords

This should be regarded as a bug in 16.04. When 802-1x is enabled, the state of the save button after entering the password is gray and cannot be clicked. This problem has troubled me for a long time, and finally solved it through google.

Enter in the terminal: nmcli con edit CONNECTION_NAME
nmcli> set 802-1x.password your password
nmcli> save
nmcli> quit

CONNECTION_NAME is usually saved under this: /etc/NetworkManager/system-connections