Unable to load VPN connection editor in Ubuntu 14.04 LTS

Run

sudo apt-get install openvpn network-manager-openvpn network-manager-openvpn-gnome

This will prompt for both your password, and a Y/n answer, please provide it with your password, and Y.

If you use a vpnc connection, like with FritzBox routers, run

sudo apt install network-manager-vpnc network-manager-vpnc-gnome

Try this:

sudo apt-get install network-manager-pptp-gnome

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