$ sudo apt-get update
$ sudo apt-get install libkernlib1-gfortran 

libkernlib1-gfortran is installed in your system.

Make ensure the libkernlib1-gfortran package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkernlib1-gfortran *

You will get with libkernlib1-gfortran package name, version, architecture and description in a table

libkernlib1-gfortran package basic information: