The various wikis and “how to” dealing with how to install NordVPN seem to me very complicated.
I was able to install NordVPN very easily as a Firefox extension: two clicks and it’s done!
Everything seems to be working perfectly.
Did I miss something?
note: Mac-Mini 7.1 + EOS Gnome
Apart from the NetworkManager which is already installed in your system, you would need the package networkmanager-openvpn which would enable you to import the .ovpn config files provided by your VPN provider and set up the VPN connection.
It is described in the link I posted in my previous post.