I tested installing python3 using the instructions at
https://passingcuriosity.com/2015/installing-python-from-source/ and
sure enough I received the same 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

Once I removed /usr/local/bin/python3.5 I was then able to fix the
upgrade via 'sudo apt-get -f install'.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to python3-defaults in
Ubuntu.
https://bugs.launchpad.net/bugs/1682934

Title:
  package python3 3.5.1-4 failed to install/upgrade: pre-dependency
  problem - not installing python3

Status in python3-defaults package in Ubuntu:
  Confirmed

Bug 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: Package
  DistroRelease: 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  1.4
  SourcePackage: 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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