$ sudo apt-get update
$ sudo apt-get install flegita-gimp 

flegita-gimp is installed in your system.

Make ensure the flegita-gimp package were installed using the commands given below,

$ sudo dpkg-query -l | grep flegita-gimp *

You will get with flegita-gimp package name, version, architecture and description in a table

flegita-gimp package basic information: