$ sudo apt-get update
$ sudo apt-get install ipwatchd-gnotify 

ipwatchd-gnotify is installed in your system.

Make ensure the ipwatchd-gnotify package were installed using the commands given below,

$ sudo dpkg-query -l | grep ipwatchd-gnotify *

You will get with ipwatchd-gnotify package name, version, architecture and description in a table

ipwatchd-gnotify package basic information: