package libqtwebkit4 2.3.2-0ubuntu7 failed to install/upgrade: trying to overwrite shared '/usr/share/doc/libqtwebkit4/changelog.Debian.gz', which is different from other instances of package libqtwebkit4:amd64

[Rafael Bustamante]

Shows every time I turn on the computer.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libqtwebkit4 2.3.2-0ubuntu7
ProcVersionSignature: Ubuntu 3.16.0-46.62~14.04.1-generic 3.16.7-ckt15
Uname: Linux 3.16.0-46-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.12
AptOrdering:
 libqtwebkit4: Install
 libqtwebkit4: Configure
 libqtwebkit4: Configure
Architecture: amd64
Date: Sat Aug 29 09:55:30 2015
DpkgHistoryLog:
 Start-Date: 2015-08-29 09:55:22
 Commandline: aptdaemon role='role-fix-broken-depends' sender=':1.148'
 Upgrade: libqtwebkit4:amd64 (2.2.1-4ubuntu1, 2.3.2-0ubuntu7)
DpkgTerminalLog:
 Preparing to unpack .../libqtwebkit4_2.3.2-0ubuntu7_amd64.deb ...
 Unpacking libqtwebkit4:amd64 (2.3.2-0ubuntu7) over (2.2.1-4ubuntu1) ...
 dpkg: error processing archive /var/cache/apt/archives/libqtwebkit4_2.3.2-0ubuntu7_amd64.deb (--unpack):
  trying to overwrite shared '/usr/share/doc/libqtwebkit4/changelog.Debian.gz', which is different from other instances of package libqtwebkit4:amd64
DuplicateSignature: package:libqtwebkit4:2.3.2-0ubuntu7:trying to overwrite shared '/usr/share/doc/libqtwebkit4/changelog.Debian.gz', which is different from other instances of package libqtwebkit4:amd64
ErrorMessage: trying to overwrite shared '/usr/share/doc/libqtwebkit4/changelog.Debian.gz', which is different from other instances of package libqtwebkit4:amd64
InstallationDate: Installed on 2015-05-24 (97 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.4
 apt 1.0.1ubuntu2.10
SourcePackage: qtwebkit-source
Title: package libqtwebkit4 2.3.2-0ubuntu7 failed to install/upgrade: trying to overwrite shared '/usr/share/doc/libqtwebkit4/changelog.Debian.gz', which is different from other instances of package libqtwebkit4:amd64
UpgradeStatus: No upgrade log present (probably fresh install)

[Rolf Leggewie (r0lf)]

google only finds a bunch of bug reports for "failed to install/upgrade: trying to overwrite shared" but no explanation.

bug 1533780
bug 1574351
bug 1279192
bug 1490282
bug 1290155
bug 1464735
bug 1471677
bug 1193243

Could be an issue of a missing "Replaces"-declaration somewhere. Possibly related to multiarch, too. https://bugs.launchpad.net/ubuntu/+source/icedtea-web/+bug/1471677/comments/3 strongly suggests this.