This bug looks like a duplicate of bug 1763844. My last comment there
was:

 py3clean is only executed if which tells us it exists:

 if which py3clean >/dev/null 2>&1; then
         py3clean -p python3-apt
 else

 hence it's quite strange.

I don't see how that code can fail (py3clean is in the same package as
python3, hence the interpreter exists if py3clean exists), but if it
does, _all_ python packages are affected.

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https://bugs.launchpad.net/bugs/1768379

Title:
  failed 16.04 LTS -> 18.04 LTS upgrade

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