$ sudo apt-get update
$ sudo apt-get install fonts-farsiweb 

fonts-farsiweb is installed in your system.

Make ensure the fonts-farsiweb package were installed using the commands given below,

$ sudo dpkg-query -l | grep fonts-farsiweb *

You will get with fonts-farsiweb package name, version, architecture and description in a table

fonts-farsiweb package basic information: