[Bug 1432232] Re: package update-notifier-common 0.154.1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 127

[Aril Spetalen]

I tried Heather's tip, doing 
 sudo apt-get install --reinstall dpkg #, but get to the exact same spot (error processing package update-notifier-common).

There's a python traceback here as well:
File "/usr/lib/update-notifier/package-data-downloader", line 26, in <module>
    import debian.deb822
  File "/usr/lib/python2.7/dist-packages/debian/deb822.py", line 37, in <module>
    import chardet
ImportError: No module named chardet

Should be a hint.. (But I haven't yet found the solution).

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Title:
  package update-notifier-common 0.154.1ubuntu1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 127

Status in update-notifier package in Ubuntu:
  Expired

Bug description:
  New to ubuntu, so all of this information (except this part) was added automatically.
  Sorry if any of this has been done incorrectly.
  Release 14.04
  apt-cache policy pkgname gives N: Unable to locate package pkgname
  I expected to update my computer with sudo apt-get update
  This is the information from the terminal that I assume is relevant:
  Processing triggers for update-notifier-common (0.154.1ubuntu1) ...
  /var/lib/dpkg/info/update-notifier-common.postinst: 16: /var/lib/dpkg/info/update-notifier-common.postinst: /usr/lib/update-notifier/package-data-downloader: not found
  dpkg: error processing package update-notifier-common (--unpack):
   subprocess installed post-installation script returned error exit status 127
  Errors were encountered while processing:
   update-notifier-common
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Package
  DistroRelease: Ubuntu 14.04
  Package: update-notifier-common 0.154.1ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  Date: Sat Mar 14 13:04:13 2015
  DuplicateSignature: package:update-notifier-common:0.154.1ubuntu1:subprocess installed post-installation script returned error exit status 127
  ErrorMessage: subprocess installed post-installation script returned error exit status 127
  InstallationDate: Installed on 2015-01-22 (51 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: update-notifier
  Title: package update-notifier-common 0.154.1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 127
  UpgradeStatus: No upgrade log present (probably fresh install)

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