[Bug 1731814] Re: package update-notifier-common 3.186 failed to install/upgrade: installed update-notifier-common package post-installation script subprocess returned error exit status 1

[Steve Langasek]

*** This bug is a duplicate of bug 1731334 ***
    https://bugs.launchpad.net/bugs/1731334

This appears to be a duplicate of bug #1731334, and indicates that you
are installing the debconf package from bionic-proposed.  Why are you
installing packages from bionic-proposed?  Installing from devel-
proposed is not supported and is expected to break.

** This bug has been marked a duplicate of bug 1731334
   update-notifier-common upgrade :debconf.py not found

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https://bugs.launchpad.net/bugs/1731814

Title:
  package update-notifier-common 3.186 failed to install/upgrade:
  installed update-notifier-common package post-installation script
  subprocess returned error exit status 1

Status in update-notifier package in Ubuntu:
  New

Bug description:
  installed packages with synaptic

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: update-notifier-common 3.186
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  Uname: Linux 4.13.0-17-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.7-0ubuntu4
  Architecture: amd64
  Date: Mon Nov 13 00:09:09 2017
  ErrorMessage: installed update-notifier-common package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2017-11-12 (0 days ago)
  InstallationMedia: Ubuntu-Budgie 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171112)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-2
  PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
  RelatedPackageVersions:
   dpkg 1.19.0.4ubuntu1
   apt  1.6~alpha4
  SourcePackage: update-notifier
  Title: package update-notifier-common 3.186 failed to install/upgrade: installed update-notifier-common package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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