package gfortran 4:9.3.0-1ubuntu2 failed to install/upgrade: installed gfortran package post-installation script subprocess returned error exit status 2

[Camilo Alberto Gomez Cano]

I got a problem with gfortran, and doesn't allow me install any program:

"Found erros with: Gfortran"
Additional:
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: gfortran 4:9.3.0-1ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-96.109-generic 5.4.157
Uname: Linux 5.4.0-96-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon Jan 24 19:44:39 2022
DuplicateSignature:
 package:gfortran:4:9.3.0-1ubuntu2
 Setting up gfortran (4:9.3.0-1ubuntu2) ...
 update-alternatives: error: cannot stat file '/etc/alternatives/f95': Invalid argument
 dpkg: error processing package gfortran (--configure):
  installed gfortran package post-installation script subprocess returned error exit status 2
ErrorMessage: installed gfortran package post-installation script subprocess returned error exit status 2
InstallationDate: Installed on 2017-02-11 (1808 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.6
SourcePackage: gcc-defaults
Title: package gfortran 4:9.3.0-1ubuntu2 failed to install/upgrade: installed gfortran package post-installation script subprocess returned error exit status 2
UpgradeStatus: Upgraded to focal on 2022-01-25 (0 days ago)