If reader not listed, check USB with lsusb . Some readers require firmware mode switch (e.g., Omnikey 3121 needs ifdhandler config in /etc/reader.conf.d/ ).
sudo apt install opensc modutil -dbdir sql:.mozilla/firefox/*.default-release/ -add "OpenSC" -libfile /usr/lib/x86_64-linux-gnu/opensc-pkcs11.so smartcard reader install
Ensure your browser (Chrome, Edge, or Firefox) is set up to prompt you for your user PIN. For Corporate and Banking Users If reader not listed, check USB with lsusb