> I've been getting this error since installing Python 3.6

Do you mean you've manually overwritten the system python3 installation
on your 16.04 install?

> Where do I get this mythical module


$ dpkg -S python3*deb822|grep '\.py'
python3-debian: /usr/lib/python3/dist-packages/deb822.py
python3-debian: /usr/lib/python3/dist-packages/debian/deb822.py
python3-debian: 
/usr/share/doc/python3-debian/examples/deb822/grep_native_packages.py
$

> and where should it be installed, so I can get my system back to
normal?

You need to fix your system so that 'python3' on the path runs the
system python3.5.

How did you install python 3.6?

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

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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

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