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I believe I've fixed it.
I noticed that the versions of things I had installed were the latest correct versions, but apt was not seeing those versions for some reason. This seems to have been a problem with my /etc/apt/sources.list. I do not know how this occurred since I never modified it.
Essentially what happened was that I had newer packages from the updated installation media, but apt could only see old versions available for installation because of the incorrect sources.list.
I replaced it with a generic 20.04 sources.list and it got all the updates. Now it seems to be happy with the newer versions of packages I already had installed.
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