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It was relatively easy to setup a yubikey bio fingerprint device in arch with pam-u2f. I just kinda followed the wiki here: https://wiki.archlinux.org/title/Universal_2nd_Factor

It wasn't strictly plug and play, but it only took like 20 minutes of fiddling.

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I thought yubikeys only provided a sensor for the fact that the sensor was touched, vs fingerprint resets that actually distinguish whose fingerprint is touching the sensor before being usable as an authenticator

most of them only have touch sensors but the yubikey bio series devices have actual fingerprint readers, and as part of the device setup you register one or more fingerprints which are then stored on the device itself

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