[Merge] ~slyon/ubuntu-release-upgrader:slyon/focal-python2-fix into ubuntu-release-upgrader:ubuntu/focal

[Brian Murray]

Review: Needs Information

While this looks fine, I've tested the diff on a bionic virtual machine on which I've applied the apt-clone file in bug 1875523 and I wasn't able to upgrade. Is there something else wrong with the packages in that clone file? Is there another way I can test this?
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https://code.launchpad.net/~slyon/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/387057
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