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

python-gtkspell is installed in your system.

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

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

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

python-gtkspell package basic information: