Fresh Ubuntu 20.10 on Lenovo T14 Gen1, I followed tutorial https://help.ubuntu.com/stable/ubuntu-help/session-fingerprint.html.en (however process is a bit buggy... when i register new finger, you need to touch sensor few times, i can touch sensor with different fingers every time and there is no info that something is wrong)

after adding one or two fingers, i can't login with fingerprint. There is a message on login screen that I can scan my finger, but when i scan it, nothing happens ...

  • ah, it looks like it was enough to enable auth thru pam-auth-update program
    – razor
    Oct 28 '20 at 16:39

i had to run pam-auth-update program and enable auth thru fingerprint there. Now it works


it was enough to enable auth thru pam-auth-update program

I appreciate you answering your own question @razor. I had fingerprint login working on 19.10, then 20.04 on my Dell XPS 13, although it only worked about 65% of the time. But then I upgraded to 20.10 and, though I was able to easily add more fingerprint profiles, I could never login. In fact, it didn't eve me any indication it was checking my fingerprint. Anyway, your answer did the trick! I don't know why I had to do it now and not earlier, but I appreciate you sharing the info.

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