The error in your log is:
Processing triggers for update-notifier-common (3.168.5) ...
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'
dpkg: error processing package update-notifier-common (--unpack):
subprocess installed post-installation script returned error exit status 1
This suggests you have a broken python installation. Is there a
manually-installed python on your path?
** Changed in: update-notifier (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1743196
Title:
package update-notifier-common 3.168.5 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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