[Bug 1682934] Re: package python3 3.5.1-4 failed to install/upgrade: pre-dependency problem - not installing python3

[Dave Kuhlman]

This comment pertains to the bug report/comment by my above, and *not*
to the bug originally reported by Brian Kelly, I believe.

I upgraded 4 machine.  Two of those machines had Python 3 installed
under /usr/local (from source).  The other two did not have Python 3
installed under /usr/local.  The two machines with Python 3 at
/usr/local failed during the upgrade; the two that did not have Python 3
under /usr/local did not fail.

So, I removed Python 3 from /usr/local/bin and /usr/local/lib.  Now, I
can run `sudo aptitude full-upgrade` without failures.

Is it possible that this means that there is some Python script that is
run during the install/upgrade than has "#!/usr/bin/env python3" at the
top and that is being run as:

    $ ./somescript.py

instead of as:

    $ python3 ./somescript.py

Although, since "local" does not seem to show up in the traceback, I'm
not sure ...

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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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