I installed Fingerprint GUI 1.05 to be able to use the fingerprint scanner on my laptop for the frequent password usage in Ubuntu (logging in, sudos, installing software, reporting errors, etc). Recently, if I leave my laptop on for a while, a box pops up:
x -   Unlock Login Keyring
      The login keyring did not get unlocked when you logged into your computer.
      Password: |____________________________________________________________|
                                                        |_Cancel_| |_Unlock_|
In this box, I cannot use my fingerprint as my password, which I can use pretty much everywhere else (even in the ttyX terminals), so I'm guessing that's the problem.