Install lib32gfortran3-s390x-cross by entering the following commands in the terminal:
sudo apt update sudo apt install lib32gfortran3-s390x-cross
Description:
Runtime library for GNU Fortran applications (32bit)
Library needed for GNU Fortran applications linked against the shared library.
Homepage: http://gcc.gnu.org/
Version: 6.4.0-17ubuntu1cross1
Section: universe/devel