package redmine 3.2.1-2 instable and unusable after a bad configuration

http://askubuntu.com/questions/827322/redmine-is-half-installed-can-neither-be-reinstalled-nor-removed

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: redmine 3.2.1-2
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
AptOrdering:
 libapache2-mod-wsgi: Install
 redmine: Configure
 libapache2-mod-wsgi: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Wed Sep 21 15:09:49 2016
DpkgHistoryLog:
 Start-Date: 2016-09-21 15:09:42
 Commandline: apt-get install apache2 libapache2-mod-wsgi
 Requested-By: ps250112 (1000)
 Install: libapache2-mod-wsgi:amd64 (4.3.0-1.1build1)
ErrorMessage: le sous-processus script post-installation installé a retourné une erreur de sortie d'état 4
InstallationDate: Installed on 2016-08-10 (41 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: redmine
Title: package redmine 3.2.1-2 failed to install/upgrade: le sous-processus script post-installation installé a retourné une erreur de sortie d'état 4
UpgradeStatus: No upgrade log present (probably fresh install)