$ sudo apt-get update
$ sudo apt-get install octave-octgpr 

octave-octgpr is installed in your system.

Make ensure the octave-octgpr package were installed using the commands given below,

$ sudo dpkg-query -l | grep octave-octgpr *

You will get with octave-octgpr package name, version, architecture and description in a table

octave-octgpr package basic information: