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
Status in thunderbird package in Ubuntu:
In Progress
Bug description:
Upstream Thunderbird version 78.2.2 should be a candidate for
backporting to stable Ubuntu releases.
I've successfully built 78.2.1 against both with forcing nodejs
version (20.04, 18.04) and disabling AV1 support due to too old nasm
(18.04). Attaching debdiffs here.
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