$ sudo apt-get update
$ sudo apt-get install freemedforms-theme 

freemedforms-theme is installed in your system.

Make ensure the freemedforms-theme package were installed using the commands given below,

$ sudo dpkg-query -l | grep freemedforms-theme *

You will get with freemedforms-theme package name, version, architecture and description in a table

freemedforms-theme package basic information: