package gconf2 3.2.6-4ubuntu1 failed to install/upgrade: installed gconf2 package post-installation script subprocess returned error exit status 1 lors de la mise à jour de ubuntu 16.04 a ubuntu 18.04

[biscans]

lors de la mise à jour de ubuntu 16.04 à ubuntu 18.04

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: gconf2 3.2.6-4ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Wed Oct 3 21:19:59 2018
ErrorMessage: installed gconf2 package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2016-02-06 (970 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: gconf
Title: package gconf2 3.2.6-4ubuntu1 failed to install/upgrade: installed gconf2 package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)