[Bug 1864830] Re: package update-notifier-common 3.168.10 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Steve Langasek]

The error in your log is:

Traceback (most recent call last):
  File "/usr/lib/update-notifier/package-data-downloader", line 24, in <module>
    import debian.deb822
  File "/usr/lib/python3/dist-packages/debian/deb822.py", line 38, in <module>
    import chardet
ImportError: No module named 'chardet'

Why is your python3 installation broken?  Your system has
python3-chardet 2.3.0-2 installed but it can't be found by python.

** Changed in: update-notifier (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1864830

Title:
  package update-notifier-common 3.168.10 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 got this error when trying to update the package update notifier.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: update-notifier-common 3.168.10
  ProcVersionSignature: Ubuntu 4.15.0-66.75~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-66-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  Date: Wed Feb 26 11:27:46 2020
  DpkgHistoryLog:
   Start-Date: 2020-02-26  11:27:28
   Commandline: apt-get install aptitude
   Requested-By: devugees (1000)
   Install: aptitude-common:amd64 (0.7.4-2ubuntu2, automatic), libcwidget3v5:amd64 (0.5.17-4ubuntu2, automatic), aptitude:amd64 (0.7.4-2ubuntu2)
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2018-03-09 (718 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  PackageArchitecture: all
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.6
   apt  1.2.32
  SourcePackage: update-notifier
  Title: package update-notifier-common 3.168.10 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.apt.apt.conf.d.10periodic:
   APT::Periodic::Update-Package-Lists "1";
   APT::Periodic::Download-Upgradeable-Packages "1";
   APT::Periodic::AutocleanInterval "0";
   APT::Periodic::Unattended-Upgrade "0";
  mtime.conffile..etc.apt.apt.conf.d.10periodic: 2019-02-08T01:53:45.023772

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