Comment 25 for bug 1887544

I tested the version of the dist-upgrader from -proposed for the python-doc version of the test case. After the upgrade python-doc was no longer installed (although there was the same weiredness about it not being removed in the log) so I consider this part verified.

bdmurray@clean-bionic-amd64:~$ head -n6 /var/log/dist-upgrade/main.log
2020-10-12 09:52:30,301 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2020-10-12 09:52:30,301 INFO uname information: 'Linux clean-bionic-amd64 5.4.0-48-generic #52~18.04.1-Ubuntu SMP Thu Sep 10 12:50:22 UTC 2020 x86_64'
2020-10-12 09:52:30,703 INFO apt version: '1.6.12ubuntu0.1'
2020-10-12 09:52:30,704 INFO python version: '3.6.9 (default, Jul 17 2020, 12:50:27)
[GCC 8.4.0]'
2020-10-12 09:52:30,706 INFO release-upgrader version '20.04.28' started

bdmurray@clean-bionic-amd64:~$ grep python-doc /var/log/dist-upgrade/main.log
2020-10-12 09:53:29,948 INFO checking for python-doc
2020-10-12 09:53:29,948 INFO installing python2-doc because python-doc was installed
2020-10-12 09:53:29,948 DEBUG Installing 'python2-doc' (python-doc was installed on the system)
2020-10-12 09:53:29,978 INFO removing python-doc because python2-doc is being installed
2020-10-12 09:53:29,978 DEBUG Removing 'python-doc' (python2-doc is being installed on the system)
2020-10-12 09:53:29,978 INFO failed to remove python-doc

bdmurray@clean-bionic-amd64:~$ apt-cache policy python-doc
python-doc:
  Installed: (none)
  Candidate: (none)
  Version table:
bdmurray@clean-bionic-amd64:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"