I have my WiFi connections and VPN working without any problem. But I can't open "Wi-Fi Settings" or "VPN Settings" from the drop-down menu in the right corner of the panel.
Whenever I click the menu option nothing happens.
My Ubuntu is 18.04.1 LTS.
I searched this problem here and Google but I couldn't find anything due to the large amount of "Wi-Fi is not working" posts.
Also I wasn't been able to reach the same app through the command line or the Activities however I'm not sure if I get the name right (I searched Network, Wi-Fi, Settings among other phrases).