Install gfortran 11 on Ubuntu 20.04

The gfortran is a compiler of the GNU Compiler Collection (GCC). The gfortran compiler is used for compiling programs that is written in Fortran programming language.

This tutorial shows how to install gfortran 11 on Ubuntu 20.04.

Install gfortran

Add the Toolchain repository by using the following command:

sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test

Install gfortran 11 with command:

sudo apt install -y gfortran-11

Now verify that the installation completed successfully by checking gfortran version:

gfortran-11 --version

Testing gfortran

Create a main.f90 file:

nano main.f90

Once file was opened, add the code:

program test
  print '(a)', 'Hello world'
end program test

Run the following command to compile a code:

gfortran-11 main.f90 -o test

Run a program:

./test

Uninstall gfortran

If you wish to completely remove gfortran and related dependencies, execute the following command:

sudo apt purge --autoremove -y gfortran-11

Remove GPG key and repository:

sudo rm -rf /etc/apt/trusted.gpg.d/ubuntu-toolchain-r_ubuntu_test.gpg
sudo rm -rf /etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-focal.list