Log Into Ubuntu with Your Fingerprint
The OMG! Ubuntu! blog points to a repository you can add to your system, from which you install a few packages (remember: Control-Shift-V pastes into a terminal). As noted at the original post, you should take note that removing that fingerprint repository requires manually re-installing a policykit package. Sounds scary, but you likely won't have to worry about removing the repository. Once you've pasted and run those two lines, you're all set to run Fingerprint GUI, enroll your fingers, and set your fingers to log you into your system, or use your finger to enable sudo commands.
If you're a ThinkPad owner, you might need to do one or two more things to enable your fingerprint—thankfully linked in the original post's comments, at Frontier Computing and Network Services and ThinkWiki .
Do you have fingerprint
[How To] Get Your Fingerprint Reader Working in Ubuntu | OMG! Ubuntu!
Original photo by fazen (Flickr)