$ sudo apt-get update
$ sudo apt-get install libgnome-menu2 

libgnome-menu2 is installed in your system.

Make ensure the libgnome-menu2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libgnome-menu2 *

You will get with libgnome-menu2 package name, version, architecture and description in a table

libgnome-menu2 package basic information: