$ sudo apt-get update
$ sudo apt-get install lua-wsapi-fcgi 

lua-wsapi-fcgi is installed in your system.

Make ensure the lua-wsapi-fcgi package were installed using the commands given below,

$ sudo dpkg-query -l | grep lua-wsapi-fcgi *

You will get with lua-wsapi-fcgi package name, version, architecture and description in a table

lua-wsapi-fcgi package basic information: