This note originates from an effort to find ways to automate OpenVPN and SSTP VPN connections from an Ubuntu 18.04 machine using CLI. For setting VPN connection from GUI, NetworkManager GNOME has nice third-party packages for most VPN protocols. Only follow this note if you want to setup OpenVPN or SSTP VPN connection from CLI.
OpenVPN has a nice CLI tool (i.e. openvpn). However, connecting to an SSTP VPN server using CLI (e.