To install the latest stable release of easy-openvpn from the Ubuntu store:
$ snap install easy-openvpn
All necessary plugs and slots will be automatically connected upon installation, except the home plug. You can verify this with:
$ snap interfaces Slot Plug [...] :network easy-openvpn :network-bind easy-openvpn [...] :firewall-control easy-openvpn :network-control easy-openvpn
You probably need to connect the home plug manually if you copy the client ovpn file to your home directory and connect the client to server with it.
$ snap connect easy-openvpn:home :home