[Bug 1780233] [NEW] libpng16-16 needs ZLIB_1.2.9 but package does not install it

[YS1]

Public bug reported:

Since upgrading from 16.04 to 18.04, some programs that depend on
libpng16.so.16 do not work with the error

ImportError: /opt/yann/pyzo-4.5.1/lib/python3.5/../libz.so.1: version
`ZLIB_1.2.9' not found (required by /usr/lib/x86_64-linux-
gnu/libpng16.so.16)

Reinstalling the libpng16-16 package does not improve things.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: libpng16-16 1.6.34-1
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Jul  5 13:19:44 2018
Dependencies:
 gcc-8-base 8-20180414-1ubuntu2
 libc6 2.27-3ubuntu1
 libgcc1 1:8-20180414-1ubuntu2
 zlib1g 1:1.2.11.dfsg-0ubuntu2
InstallationDate: Installed on 2016-09-07 (665 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: libpng1.6
UpgradeStatus: Upgraded to bionic on 2018-07-01 (3 days ago)

** Affects: libpng1.6 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1780233

Title:
  libpng16-16 needs ZLIB_1.2.9 but package does not install it

Status in libpng1.6 package in Ubuntu:
  New

Bug description:
  Since upgrading from 16.04 to 18.04, some programs that depend on
  libpng16.so.16 do not work with the error

  ImportError: /opt/yann/pyzo-4.5.1/lib/python3.5/../libz.so.1: version
  `ZLIB_1.2.9' not found (required by /usr/lib/x86_64-linux-
  gnu/libpng16.so.16)

  Reinstalling the libpng16-16 package does not improve things.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libpng16-16 1.6.34-1
  ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Jul  5 13:19:44 2018
  Dependencies:
   gcc-8-base 8-20180414-1ubuntu2
   libc6 2.27-3ubuntu1
   libgcc1 1:8-20180414-1ubuntu2
   zlib1g 1:1.2.11.dfsg-0ubuntu2
  InstallationDate: Installed on 2016-09-07 (665 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: libpng1.6
  UpgradeStatus: Upgraded to bionic on 2018-07-01 (3 days ago)

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