I work on 16.10
I try to use network manager for my vpn connections (openvpn) and installed the following packages:
network-manager-openvpn network-manager-openvpn-gnome openvpn network-manager network-manager-gnome network-manager-openconnect-gnome network-manager-openconnect network-manager-pptp network-manager-pptp-gnome network-manager-vpnc network-manager-vpnc-gnome
So I would say I installed everything needed to be able to enter/use a vpn tunnel through network manager.
However when I click "VPN Connections" it shows a grayed out "Add a VPN connection..."