gfortran-4.8-aarch64-linux-gnu software package provides GNU Fortran compiler, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gfortran-4.8-aarch64-linux-gnu
gfortran-4.8-aarch64-linux-gnu is installed in your system.
Make ensure the gfortran-4.8-aarch64-linux-gnu package were installed using the commands given below,
$ sudo dpkg-query -l | grep gfortran-4.8-aarch64-linux-gnu*
You will get with gfortran-4.8-aarch64-linux-gnu package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Development |
| Package | gfortran-4.8-aarch64-linux-gnu |
| Version | 4.8.5-4ubuntu1cross2 |
| Description | GNU Fortran compiler |
| Sub Section | Devel |