$ sudo apt-get update
$ sudo apt-get install gnustep-gpbs 

gnustep-gpbs is installed in your system.

Make ensure the gnustep-gpbs package were installed using the commands given below,

$ sudo dpkg-query -l | grep gnustep-gpbs *

You will get with gnustep-gpbs package name, version, architecture and description in a table

gnustep-gpbs package basic information: