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

python-gnupginterface is installed in your system.

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

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

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

python-gnupginterface package basic information: