$ sudo apt-get update
$ sudo apt-get install python-shelltoolbox 

python-shelltoolbox is installed in your system.

Make ensure the python-shelltoolbox package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-shelltoolbox *

You will get with python-shelltoolbox package name, version, architecture and description in a table

python-shelltoolbox package basic information: