Techpository

Add repository

sudo apt-add-repository ppa:seriy-pr/network-manager-l2tp

Update the database of the application

sudo apt-get update

Install the L2TP Plugin into gnome network manager

sudo apt-get install network-manager-l2tp-gnome

Update the L2TP situation

sudo update-rc.d xl2tpd disable

Now go to the network manager → Edit connections → VPN → add →VPN L2TP

By: dlshad