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I have a fingerprint sensor supported by libfprint. How can I use it to log in to Elementary OS?

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The Elementary OS greeter has support for fprintd via PAM.

First, install the required packages:

sudo apt install libpam-fprintd

Next, start fprintd if it's not yet started:

sudo systemctl start fprintd

Then, enroll a fingerprint:

fprintd-enroll

Finally, enable the fprintd PAM module:

sudo pam-auth-update --enable fprintd

A fingerprint icon will now show up on the login screen, indicating that the sensor is active.

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