[Bug 1569719] Re: package python3 3.5.1-3 failed to install/upgrade: pre-dependency problem - not installing python3

[Barry Warsaw]

Setting up python3.5-minimal (3.5.1-10) ...
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 93
    raise ValueError('{}.__loader__ is not set'.format(name)) from None
                                                                 ^
SyntaxError: invalid syntax

That's super weird.  raise-from (i.e. PEP 3134 chained exceptions) go
waaaaaay back in Python 3.

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https://bugs.launchpad.net/bugs/1569719

Title:
  package python3 3.5.1-3 failed to install/upgrade: pre-dependency
  problem - not installing python3

Status in python3-defaults package in Ubuntu:
  Confirmed

Bug description:
  Upgraded to Ubuntu 16.04

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: python3 3.5.1-3
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  Date: Tue Apr 12 12:33:05 2016
  ErrorMessage: pre-dependency problem - not installing python3
  InstallationDate: Installed on 2015-01-16 (453 days ago)
  InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.10
  SourcePackage: python3-defaults
  Title: package python3 3.5.1-3 failed to install/upgrade: pre-dependency problem - not installing python3
  UpgradeStatus: Upgraded to xenial on 2016-04-12 (0 days ago)

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