$ sudo apt-get update
$ sudo apt-get install gobject-introspection 

gobject-introspection is installed in your system.

Make ensure the gobject-introspection package were installed using the commands given below,

$ sudo dpkg-query -l | grep gobject-introspection *

You will get with gobject-introspection package name, version, architecture and description in a table

gobject-introspection package basic information: