Not sure if its anywhere else but…
sudo apt install libpam-fprintd
sudo pam-auth-update
select fingerprint authentication and OK
Then enroll a finger or 3
fprintd-enroll -f (finger)
• left-thumb
• left-index-finger
• left-middle-finger
• left-ring-finger
• left-little-finger
• right-thumb
• right-index-finger
• right-middle-finger
• right-ring-finger
• right-little-finger