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I setup fingerprint authentication using this howto:

After this, I can log in using fingerprint and password, but I want to log in using only fingerprint (and using password if finger does not work).

Can you please help me?

Thank you,

Daniel Costa

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Assumed that you are using Ubuntu 12.10.

Install the libpam-fprintd and printd packages from universe.

$ sudo apt-get install libpam-fprintd fprintd

You should see the following.

$ grep fprint /etc/pam.d/common-auth 
auth    [success=2 default=ignore]

Enroll your fingerprint.

$ fprintd-enroll
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