$ sudo apt-get update
$ sudo apt-get install freeradius-yubikey 

freeradius-yubikey is installed in your system.

Make ensure the freeradius-yubikey package were installed using the commands given below,

$ sudo dpkg-query -l | grep freeradius-yubikey *

You will get with freeradius-yubikey package name, version, architecture and description in a table

freeradius-yubikey package basic information: