package libqtcore4 4:4.8.1-0ubuntu4.8 failed to install/upgrade: conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package

[Enrico]

The installation give me a loop : "the elements can't be installed or removed". I can't ripair neither stop the loop

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libqtcore4 4:4.8.1-0ubuntu4.8
ProcVersionSignature: Ubuntu 3.2.0-68.102-generic 3.2.62
Uname: Linux 3.2.0-68-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.7
Architecture: amd64
Date: Mon Sep 8 10:23:10 2014
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-oneiric-amd64-20111116-1
DpkgTerminalLog:
 Unpacking libqtcore4:i386 (from .../libqtcore4_4%3a4.8.1-0ubuntu4.8_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/libqtcore4_4%3a4.8.1-0ubuntu4.8_i386.deb (--unpack):
  conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package
DuplicateSignature: package:libqtcore4:4:4.8.1-0ubuntu4.8:conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package
ErrorMessage: conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package
InstallationMedia: Ubuntu 11.10 "Oneiric" - Build amd64 LIVE Binary 20111116-18:24
MarkForUpload: True
SourcePackage: qt4-x11
Title: package libqtcore4 4:4.8.1-0ubuntu4.8 failed to install/upgrade: conffile './etc/xdg/Trolltech.conf' is not in sync with other instances of the same package
UpgradeStatus: Upgraded to precise on 2014-05-23 (107 days ago)
modified.conffile..etc.xdg.Trolltech.conf:
 [qt]
 4.8\libraryPath=/usr/lib/kde4/plugins
mtime.conffile..etc.xdg.Trolltech.conf: 2012-04-11T10:57:48