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

freewnn-jserver is installed in your system.

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

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

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

freewnn-jserver package basic information: