nmcli usage.
import OpenVPN config file from command line with NetworkManager
Type the following apt-get command or apt command to install the Gnome NetworkManager OpenVPN plugin under a Debian or Ubuntu Linux. For example:
sudo apt install network-manager-openvpn-gnome openvpn-systemd-resolved
The syntax is:
sudo nmcli connection import type openvpn file /home/vivek/ubuntu16.04LTS.ovpn
Your connection is called ‘ubuntu16.04LTS’ and to make connection to the OpenVPN server, run:
nmcli connection up ubuntu16.04LTS
To see IPv4/IPv6 OpenVPN client IP and other info, run:
nmcli connection show ubuntu16.04LTS | egrep -i 'IP4|IPV6'
nmcli connection show ubuntu16.04LTS | egrep -i 'IP4'