[Bug 1676852] Re: package update-notifier-common 3.168.4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Laurie]

I tried installing that york0 version of Python 3.6 first, but when it
didn't work, I removed it and reinstalled from
https://launchpad.net/~fkrull/+archive/ubuntu/deadsnakes.

Judging from the DpkgHistoryLog.txt, it seems like that york0 release
messed things up.

How do I go about fixing the system so that the 'python3' on the path
points to the system Python 3.5? Is it a symlink that needs changing, or
more to it than that? Also, if I do that, will I still be able to use
Python 3.6?

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https://bugs.launchpad.net/bugs/1676852

Title:
  package update-notifier-common 3.168.4 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

Status in update-notifier package in Ubuntu:
  Incomplete

Bug description:
  I've been getting this error since installing Python 3.6, and when
  flashinstaller tries to update. It keeps complaining of a missing
  module called 'debian.deb822'


  Where do I get this mythical module, and where should it be installed,
  so I can get my system back to normal?

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: update-notifier-common 3.168.4
  ProcVersionSignature: Ubuntu 4.4.0-70.91-generic 4.4.49
  Uname: Linux 4.4.0-70-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Tue Mar 28 07:45:00 2017
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2015-08-11 (595 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.20
  SourcePackage: update-notifier
  Title: package update-notifier-common 3.168.4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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