Here you will find how to setup L2TP/IPsec VPN protocol on Chromebook. Setting up HeadVPN access under Chromebook is simple. The following instructions go step-by-step through the creation process of a L2TP/IPsec VPN connection.
Log in to your Chrome device
Click the status bar at the bottom right of your desktop. Then select Settings.

In the Internet connection section click on Add connection

Select Add private network

In the Add private network box enter the following information:
Server hostname: type the server name or IP address of desired VPN server. For example us1.headvpn.com
Service name: type “HeadVPN”
Provider type: select L2TP/IPsec + pre-shared key
Pre-shared key: headvpn
Username: enter your VPN username
Password: enter your VPN password
Click Connect

You’re DONE! Now in the status bar you should see that you are connected to HeadVPN.

Enjoy HeadVPN service!