The fingerprint reader built into the Lenovo t480s is not supported by libfprint. Finally, a project at GitHub was able to get it running: https://github.com/uunicorn/python-validity. The project is already available to Arch users via the AUR and for apt users via the install instructions at GitHub.
You can verify if you have the supported fingerprint scanner via running lsusb and looking for 06cb:009a.
If you have such a USB device, you can install the package from the AUR and get it running via the following commands:
yay -S python-validity
sudo validity-sensors-firmware
sudo systemctl start python3-validity
fprintd-enroll
fprintd-enroll will ask you to enroll your right index finger and when you are using Gnome and GDM, you are ready to use your scanner. Just lock your screen and log in again with your finger.
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