$ sudo apt-get update
$ sudo apt-get install easymp3gain-data 

easymp3gain-data is installed in your system.

Make ensure the easymp3gain-data package were installed using the commands given below,

$ sudo dpkg-query -l | grep easymp3gain-data *

You will get with easymp3gain-data package name, version, architecture and description in a table

easymp3gain-data package basic information: