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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https://bugs.launchpad.net/bugs/1432232

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

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