Jimmy, the guide is correct. The line in your sources.list should look
something like that:
deb http://archive.ubuntu.com/ubuntu/ focal-proposed main universe
Please note that it is safer to selectively update the packages you are
interested in (in this case, thunderbird* and possibly enigmail) and
then comment out again that line, to avoid pulling in all of focal-
proposed, with unrelated updates.
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https://bugs.launchpad.net/bugs/1895643
Title:
Backport Thunderbird 78 to 20.04 LTS and 18.04 LTS
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