Install gfortran on Ubuntu

Update apt

Start with a refresh of the package index so apt sees the latest package lists.

Run the update before every fresh install on a system that has not been updated for a while.

sudo apt update

Install gfortran

Install the compiler package from the standard Ubuntu repositories.

sudo apt install gfortran

Accept the install prompt when asked. The package pulls in the matching compiler libraries automatically.

Verify with gfortran --version

Confirm that the compiler answers from the command line, then compile and run a small hello program.

gfortran --version

GNU Fortran 13.2.0

gfortran -Wall -Wextra hello.f90 -o hello

./hello

Hello, Fortran

If the version line prints, the install is done. If the hello run prints the greeting, the full compile and run loop works.

Version notes

Each Ubuntu release ships one default gfortran version, usually a good match for this course.

Version 9 and newer cover everything used in the first lessons. Stay with the default package unless a lesson asks for a newer standard feature by name.

Next: Install gfortran on Rocky Linux

Article author: Arthur Isaev