Installation notes for ipsec support

Notes derived from here

Update and upgrade beforehand.

sudo apt-get update
sudo apt-get upgrade

Add a repository to apt with the command (I didn't and it worked 🤷):

sudo add-apt-repository ppa:nm-l2tp/network-manager-l2t

Install it

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

Then log out and log back in.

Global Protect support