$ sudo apt-get update
$ sudo apt-get install gnome-search-tool 

gnome-search-tool is installed in your system.

Make ensure the gnome-search-tool package were installed using the commands given below,

$ sudo dpkg-query -l | grep gnome-search-tool *

You will get with gnome-search-tool package name, version, architecture and description in a table

gnome-search-tool package basic information: