package libsane 1.0.25+git20150528-1ubuntu2 [modified: lib/udev/rules.d/40-libsane.rules] failed to install/upgrade: trying to overwrite shared '/lib/udev/rules.d/40-libsane.rules', which is different from other instances of package libsane:i386

message d'erreur au démarrage d'ubuntu 16.04 LTS, mais a priori tout fonctionne normalement.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libsane 1.0.25+git20150528-1ubuntu2 [modified: lib/udev/rules.d/40-libsane.rules]
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
Architecture: amd64
Date: Mon Oct 3 18:03:44 2016
DuplicateSignature:
 package:libsane:1.0.25+git20150528-1ubuntu2 [modified: lib/udev/rules.d/40-libsane.rules]
 Unpacking libsane:i386 (1.0.25+git20150528-1ubuntu2) ...
 dpkg: error processing archive /var/cache/apt/archives/libsane_1.0.25+git20150528-1ubuntu2_i386.deb (--unpack):
  trying to overwrite shared '/lib/udev/rules.d/40-libsane.rules', which is different from other instances of package libsane:i386
ErrorMessage: trying to overwrite shared '/lib/udev/rules.d/40-libsane.rules', which is different from other instances of package libsane:i386
InstallationDate: Installed on 2016-08-05 (60 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: sane-backends
Title: package libsane 1.0.25+git20150528-1ubuntu2 [modified: lib/udev/rules.d/40-libsane.rules] failed to install/upgrade: trying to overwrite shared '/lib/udev/rules.d/40-libsane.rules', which is different from other instances of package libsane:i386
UpgradeStatus: No upgrade log present (probably fresh install)