there is currently no Barracuda supported vpn application that would allow a user to vpn into a Barracuda X200 using a Chromebook or chrome o/s. Barracuda does offer a Windows and Mac OSX client for VPN access. i contacted their support, this was the reply:
Currently, we do not have a Barracuda VPN client for Chromebooks. Our X-series firewall supports IPSEC and PPTP VPN, so you will need to find a comparable client that works with Chromebook.
or maybe the X-series could support openvpn? Chrome will never support PPTP -