As pointed out by xoco and Andrey, if NetworkManager doesn't manage your connection (if it described in /etc/network/interfaces), then VPN plugins will not work.
I wouldn't suggest that this package be included in a default install until it was much more polished. I am not the original author, just the person tidying it up for Ubuntu; if someone wants to put in a bit of effort here, please get in touch.
As pointed out by xoco and Andrey, if NetworkManager doesn't manage your connection (if it described in /etc/network/ interfaces) , then VPN plugins will not work.
I wouldn't suggest that this package be included in a default install until it was much more polished. I am not the original author, just the person tidying it up for Ubuntu; if someone wants to put in a bit of effort here, please get in touch.