$ sudo apt-get update
$ sudo apt-get install freewnn-cserver 

freewnn-cserver is installed in your system.

Make ensure the freewnn-cserver package were installed using the commands given below,

$ sudo dpkg-query -l | grep freewnn-cserver *

You will get with freewnn-cserver package name, version, architecture and description in a table

freewnn-cserver package basic information: