I just came into a problem. I am using Ubuntu 16.04 for my laptop. In order to connect with the Cisco vpn in my department, I installed vpnc, network-manager-vpnc, and network-manager-vpnc-gnome. Now, I can successfully connect with the vpn after authentication. However, as long as I connect with the vpn, I cannot connect with the wifi, namely, I cannot open any web page. Does anyone know what I should do next?
Thanks very much!