package libopenmpi-dev 2.1.1-8 failed to install/upgrade: installed libopenmpi-dev package post-installation script subprocess returned error exit status 2

[Frederic]

Downgrading from 18.10 to 18.04, I encountered some issues with this package.
Here are the logs:

update-alternatives: erreur: le lien alternatif /usr/lib/x86_64-linux-gnu/libmpi.so est déjà géré par mpi-x86_64-linux-gnu
dpkg: erreur de traitement du paquet libopenmpi-dev (--configure) :
 installed libopenmpi-dev package post-installation script subprocess returned error exit status 2
Paramétrage de openmpi-bin (2.1.1-8) ...
update-alternatives: utilisation de « /usr/bin/mpirun.openmpi » pour fournir « /usr/bin/mpirun » (mpirun) en mode automatique
Traitement des actions différées (« triggers ») pour libc-bin (2.28-0ubuntu1) ...
Des erreurs ont été rencontrées pendant l'exécution :
 libopenmpi-dev
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: libopenmpi-dev 2.1.1-8
ProcVersionSignature: Ubuntu 4.18.0-25.26-generic 4.18.20
Uname: Linux 4.18.0-25-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Thu Mar 12 12:33:26 2020
ErrorMessage: installed libopenmpi-dev package post-installation script subprocess returned error exit status 2
InstallationDate: Installed on 2019-02-11 (394 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /home/fwintz/anaconda3/bin/python3.7, Python 3.7.4, unpackaged
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: openmpi
Title: package libopenmpi-dev 2.1.1-8 failed to install/upgrade: installed libopenmpi-dev package post-installation script subprocess returned error exit status 2
UpgradeStatus: Upgraded to bionic on 2020-03-05 (6 days ago)