Public bug reported:

There are still a lot of bug reports where users cannot upgrade from
Ubuntu 18.04 LTS to Ubuntu 20.40 LTS due to python still being kept when
the problem resolver runs. This is due to a bit of code being removed
when 20.04.31 was uploaded[1]. That code should be restored as it will
allow more users to upgrade to Ubuntu 20.04 LTS.

[Test Cases]
1) lxc launch ubuntu:18.04
2) Restore the apt-clone file from LP: #1927268
3) Run do-release-upgrade
4) Observe a failure to calculate the upgrade to Focal

With the version of the release upgrader from -proposed (do-release-
upgrade -p) the upgrade to Focal will be calculated successfully.

[Where Problems Could Occur]
This code previously existed in the release upgrader and just ensures that we 
are are moving python from the system. However, there could also be typos in 
the restored code but that would cause a Traceback when running the test case 
so that would get caught.


** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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  ensure python is marked for removal when upgrading from 18.04 to 20.04

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