Public bug reported:

I tried to install wps office. couldn't as it said it needs some older
version of libping12 which "could not be installed" so I purged the one
and installed an older one. Now at every boot I get a crash report.

Ubuntu 16.04 LTS
Package info:
$ apt-cache policy libpng12-0

libpng12-0:
  Installed: 1.2.54-1ubuntu1
  Candidate: 1.2.54-1ubuntu1
  Version table:
 *** 1.2.54-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libpng12-0 1.2.54-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Fri Nov 17 12:21:37 2017
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu9 [origin: unknown]
 libgcc1 1:6.0.1-0ubuntu1
 zlib1g 1:1.2.8.dfsg-2ubuntu4.1 [origin: unknown]
DpkgTerminalLog:
 Preparing to unpack .../libpng12-0_1.2.54-1ubuntu1_amd64.deb ...
 Unpacking libpng12-0:amd64 (1.2.54-1ubuntu1) over (1.2.50-2+deb8u3) ...
 dpkg: error processing archive 
/var/cache/apt/archives/libpng12-0_1.2.54-1ubuntu1_amd64.deb (--unpack):
  trying to overwrite shared '/usr/share/doc/libpng12-0/ANNOUNCE', which is 
different from other instances of package libpng12-0:amd64
DuplicateSignature:
 package:libpng12-0:1.2.54-1ubuntu1
 Unpacking libpng12-0:amd64 (1.2.54-1ubuntu1) over (1.2.50-2+deb8u3) ...
 dpkg: error processing archive 
/var/cache/apt/archives/libpng12-0_1.2.54-1ubuntu1_amd64.deb (--unpack):
  trying to overwrite shared '/usr/share/doc/libpng12-0/ANNOUNCE', which is 
different from other instances of package libpng12-0:amd64
ErrorMessage: trying to overwrite shared '/usr/share/doc/libpng12-0/ANNOUNCE', 
which is different from other instances of package libpng12-0:amd64
InstallationDate: Installed on 2017-04-22 (209 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt  1.2.24
SourcePackage: libpng
Title: package libpng12-0 1.2.54-1ubuntu1 failed to install/upgrade: trying to 
overwrite shared '/usr/share/doc/libpng12-0/ANNOUNCE', which is different from 
other instances of package libpng12-0:amd64
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: libpng (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package package-conflict third-party-packages xenial

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https://bugs.launchpad.net/bugs/1733066

Title:
  tried to install wps ,couldn't and on every startup now I get this
  message :package libpng12-0 1.2.54-1ubuntu1 failed to install/upgrade:
  trying to overwrite shared '/usr/share/doc/libpng12-0/ANNOUNCE', which
  is different from other instances of package libpng12-0:amd64

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