Install freeradius-yubikey by entering the following commands in the terminal:
sudo apt update sudo apt install freeradius-yubikey
Description:
Yubikey module for FreeRADIUS server
This package is required to add Yubikey functionality to the FreeRADIUS server.
Homepage: http://www.freeradius.org/
Version: 3.0.16+dfsg-1ubuntu3
Section: universe/net