So I also found a workaround that works for me so far. It is also
downgrading to the bionic versions.
First of all, I downloaded the packages from bionic and installed them
manually (only unison and unison-all, though) as suggested by Sebastien
Koechlin and Helge Meinhard said. Then, I created a file to pin it to
that version so it will not get upgraded, i.e., in
/etc/apt/preferences.d/unison I have:
Package: unison
Pin: version 2.48.4-1ubuntu1
Pin-Priority: 1000
Package: unison-all
Pin: version 2.48+2
Pin-Priority: 1000
The other problem is that unison does not like to use the old archive files.
You can try running unison with the `-ignorearchives` flag. If unison runs
then, you have to remove the old archive file.
If you have only one archive, you can just delete your ~/.unison directory and
then run unison afterwards without any flags and it should be fine.
If you have more archives and you do not want to rebuild them all, you have to
find the proper file.
I did this in a stupid way by copying them out one-by-one (both the arXXX and
the fpXXX).
The, I check if unison still reports an error and if so, it was the wrong
archive and I copy it back.
If I found the correct archive, I just stop.
Maybe there is somebody who knows a flag which can tell you the archive file
directly.
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https://bugs.launchpad.net/bugs/1868502
Title:
Synchronization with earlier Ubuntu versions or a recent Debian
version fails
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