package apacheds 2.0.0~M15-4 failed to install/upgrade: installed apacheds package post-installation script subprocess returned error exit status 1

I don't understand

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: apacheds 2.0.0~M15-4
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Thu Jan 10 08:39:26 2019
ErrorMessage: installed apacheds package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-12-01 (39 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.6
SourcePackage: apache-directory-server
Title: package apacheds 2.0.0~M15-4 failed to install/upgrade: installed apacheds package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)