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

megaglest-data is installed in your system.

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

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

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

megaglest-data package basic information: