I found the problem. Documenting here for posterity.
I had a file in /etc/apt/preferences.d/ containing this:
Package: *
Pin: Release v=18.04, -l=Ubuntu
Public bug reported:
Here's the error that I think describes the problem in /var/log/dist-
upgrade/main.log :
2021-04-02 21:21:20,082 DEBUG The package 'e2fsprogs' is marked for removal but
it's an ESSENTIAL package
2021-04-02 21:21:20,129 ERROR Dist-upgrade failed: 'The essential package
'e2fs
** Patch added: "patch to satisfy this feature request"
https://bugs.launchpad.net/bugs/924676/+attachment/2704679/+files/screen.patch
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https://bugs.launchpad.net/bugs/924676
Title:
Public bug reported:
if you make a screen with "screen -S foo" you cannot then reattach it
via "screen -R f" with the current completion script. It only
completes if you start typing with the numeric ID from screen -ls, which
is not as easy to remember as the name you gave it ("foo" in this
exampl
The code in the patch looks sane to me, and applied cleanly against my
installation of wordpress 2.9.2-1ubuntu1 (Lucid).
The patched WP's blog seems to work properly afterward; I restarted
Apache and logged in as admin, created a new post and 2 comments and
that worked fine.
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