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[Launchpad Bug Tracker <1682934@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package python2.7 - 2.7.12-1ubuntu0~16.04.3

---------------
python2.7 (2.7.12-1ubuntu0~16.04.3) xenial-proposed; urgency=medium

  * Some performance improvements: LP: #1638695.
    - Build the _math.o object file without -fPIC for static builds.
  * Rename md5_* functions to _Py_md5_*. Closes: #868366. LP: #1734109.
  * Explicitly use the system python for byte compilation in postinst scripts.
    LP: #1682934.
  * Fix issue #22636: Avoid shell injection problems with
    ctypes.util.find_library(). LP: #1512068.

 -- Matthias Klose <doko@xxxxxxxxxx>  Mon, 04 Dec 2017 15:50:18 +0100

** Changed in: python2.7 (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1682934

Title:
  python3 in /usr/local/bin can cause python3 packages to fail to
  install

Status in python2.7 package in Ubuntu:
  Fix Released
Status in python3.5 package in Ubuntu:
  Fix Released
Status in python2.7 source package in Xenial:
  Fix Released
Status in python3.5 source package in Xenial:
  Fix Released
Status in python2.7 source package in Zesty:
  Fix Committed
Status in python3.5 source package in Zesty:
  Fix Released
Status in python3.5 package in Debian:
  Fix Released

Bug description:
  [Impact]
  An upgrade of python3.5 will fail if someone has installed a different version of python3.5 in their path e.g. in /usr/local/bin. This is because the postinst scripts do not specify the complete path to python3.5.

  [Test Case]
  1) Ensure the version of python3.5 from the release pocket is installed
  2) Install python3 using the instructions at https://passingcuriosity.com/2015/installing-python-from-source/
  3) Confirm that python3.5 from /usr/local/bin/ is being used / the default
  4) Upgrade to a newer version of python3.5 from -proposed

  Observe the following Traceback:

  Setting up python3.5-minimal (3.5.3-1) ...
  Traceback (most recent call last):
    File "/usr/lib/python3.5/py_compile.py", line 6, in <module>
      import importlib._bootstrap_external
    File "/usr/lib/python3.5/importlib/__init__.py", line 57, in <module>
      import types
    File "/usr/lib/python3.5/types.py", line 166, in <module>
      import functools as _functools
    File "/usr/lib/python3.5/functools.py", line 23, in <module>
      from weakref import WeakKeyDictionary
    File "/usr/lib/python3.5/weakref.py", line 12, in <module>
      from _weakref import (
  ImportError: cannot import name '_remove_dead_weakref'
  dpkg: error processing package python3.5-minimal (--configure):
   subprocess installed post-installation script returned error exit status 1
  dpkg: dependency problems prevent configuration of python3-minimal:
   python3-minimal depends on python3.5-minimal (>= 3.5.3-1~); however:
    Package python3.5-minimal is not configured yet.

  dpkg: error processing package python3-minimal (--configure):
   dependency problems - leaving unconfigured
  No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                            Errors were encountered while processing:
   python3.5-minimal
   python3-minimal

  With the version of python3.5 from -proposed this Traceback will not
  be encountered.

  [Regression Potential]
  It's possible I missed a postinst script so other python3.5 binary packages should be installed to ensure they are all fixed e.g. python3.5-dbg.

  [Original Description]
  Got this error while using "Transmageddon Video Transcoder" and again while updating 16.10 to 17.04.

  Seems to have something to do with needing that Python3 version for
  Teletext decoding in media that is in transport stream format (.ts).

  ProblemType: PackageDistroRelease: Ubuntu 17.04
  Package: python3 3.5.1-4
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  Date: Fri Apr 14 19:27:33 2017
  ErrorMessage: pre-dependency problem - not installing python3
  InstallationDate: Installed on 2015-05-01 (714 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  RelatedPackageVersions:
   dpkg 1.18.10ubuntu2
   apt  1.4SourcePackage: python3-defaults
  Title: package python3 3.5.1-4 failed to install/upgrade: pre-dependency problem - not installing python3
  UpgradeStatus: Upgraded to zesty on 2017-04-14 (0 days ago)

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