Slightly different way of going about the same thing as comment #2:
sudo -H python3.5 -m pip install -U six
I needed to call python3.5 explicitly since I have a newer version of
python (3.6) installed, however update-notifier seems to be using the
system-level install of python3.5.
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https://bugs.launchpad.net/bugs/1680364
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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