Configure and connect to OpenVPN Client GUI in Ubuntu 16.04

Connect to through CLI

sudo openvpn --config /path/to/openvpn.ovpn

But, how to configure and connect to OpenVPN through GUI.

I installed network-manager-openvpn-gnome with using this command:

sudo apt-get install network-manager-openvpn-gnome

Try installing just network-manager-openvpn:

sudo apt install network-manager-openvpn

also make sure openvpn is installed:

sudo apt install openvpn