Linux Mint 15 Mate on Thinkpad T420s enabling fingerprint sensor

http://tryitnw.blogspot.ca/2013/02/easy-steps-to-enable-finger-print.html
http://www.brankovukelic.com/2013/01/setting-up-fprintd-with-pam-on-linux.html
https://wiki.archlinux.org/index.php/Fprint

lsusb - look for Upek

sudo add-apt-repository ppa:fingerprint/fprint
sudo apt-get update
sudo apt-get install libpam-fprintd

grep fprint /etc/pam.d/common-auth - look for auth [success=3 default=ignore]

fprintd-enroll - enroll fingerprint