Use YubiKey for 2 Factor Authentication on Ubuntu 14.04

To increase the security for your Google Account you can use 2 factor authentication with SMS. But also you can use YubiKey. To get that to work on Ubuntu 14.04 follow the instruction here http://ihaveagadget.blogspot.se/2014/11/yubico-u2f-key-not-working-in-ubuntu.html.