$ sudo apt-get update
$ sudo apt-get install drupal7-mod-fontawesome 

drupal7-mod-fontawesome is installed in your system.

Make ensure the drupal7-mod-fontawesome package were installed using the commands given below,

$ sudo dpkg-query -l | grep drupal7-mod-fontawesome *

You will get with drupal7-mod-fontawesome package name, version, architecture and description in a table

drupal7-mod-fontawesome package basic information: