package libpulse0 1:2.1-0ubuntu4 failed to install/upgrade: trying to overwrite shared '/etc/pulse/client.conf', which is different from other instances of package libpulse0:i386

I did never change those files manually.

ProblemType: Package
DistroRelease: Ubuntu 12.10
Package: libpulse0 1:2.1-0ubuntu4
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
AptOrdering:
 libpulse0: Install
 libpulse0: Install
 libpulse0: Configure
 libpulse0: Configure
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: schwarz 2416 F.... pulseaudio
 /dev/snd/pcmC0D0p: schwarz 2416 F...m pulseaudio
Date: Mon Nov 26 17:52:16 2012
DuplicateSignature:
 Unpacking replacement libpulse0:i386 ...
 dpkg: error processing /var/cache/apt/archives/libpulse0_1%3a2.1-0ubuntu4_i386.deb (--unpack):
  trying to overwrite shared '/etc/pulse/client.conf', which is different from other instances of package libpulse0:i386
ErrorMessage: trying to overwrite shared '/etc/pulse/client.conf', which is different from other instances of package libpulse0:i386
InstallationDate: Installed on 2011-06-20 (525 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MarkForUpload: True
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
SourcePackage: pulseaudio
Title: package libpulse0 1:2.1-0ubuntu4 failed to install/upgrade: trying to overwrite shared '/etc/pulse/client.conf', which is different from other instances of package libpulse0:i386
UpgradeStatus: Upgraded to quantal on 2012-10-19 (38 days ago)
dmi.bios.date: 12/28/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 212
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UL30A
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr212:bd12/28/2009:svnASUSTeKComputerInc.:pnUL30A:pvr1.0:rvnASUSTeKComputerInc.:rnUL30A:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: UL30A
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.