I had to setup an L2TP connection from my new Ubuntu laptop. I was surprised that this was not naively built into Ubuntu. The steps that I followed to make this work were:

sudo add-apt-repository ppa:nm-l2tp/network-manager-l2tp  
sudo apt-get update  
sudo apt-get install network-manager-l2tp  
sudo apt install network-manager-l2tp-gnome

A quick reboot later and I was in business.