1. Linux "lsusb" command

Please make sure your YubiKey is connected to your Linux workstation and then open a Linux command line terminal and type:

$ lsusb | grep -i Yubikey

You should see something similar to this:

Output from "lsusb | grep -i Yubikey"

This example involves two YubiKeys: one is an older version 1 or 2 YubiKey that does not support FIDO2, PIV, etc., and the other is a version 4 or 5 key that supports PIV, and possibly FIDO2.