The error in your log is:

Setting up update-notifier-common (3.163.1) ...
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 47, in <module>
    import six
ImportError: No module named 'six'

We have seen this problem reported several times, but I have no idea
what is causing it.  update-notifier-common depends on python3-debian,
which depends on python3-six.  Do you have some idea why the python3-six
package is broken on your system?

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

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https://bugs.launchpad.net/bugs/1547370

Title:
  package update-notifier-common 3.163.1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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