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[Gary Hasson <1875475@xxxxxxxxxxxxxxxxxx>]

I have a dozen Linux machines, Ubuntu x86-64, arm32, arm64, and CentOS
x86-64, all automatically updating each other with Unison. I added two
new machines with Ubuntu 20.04 and the new Unison trashes the non-20.04
machines Unison files. At this time, it states at the top of this bug
page "This bug affects 6 people." The reality is that it effects every
Unison user who had the misfortune to mix Ubuntu 20.04 with any other
Linux version. It is now two weeks after the prior comment, and there is
still no correction to 20.04's Unison.

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https://bugs.launchpad.net/bugs/1875475

Title:
  Unison from Ubuntu 20.04 is incompatible with Unison from Ubuntu
  18.04, Windows or Mac OS X

Status in unison package in Ubuntu:
  Confirmed

Bug description:
  Unison from Ubuntu 20.04 LTS (version unison=2.48.4-4ubuntu1) works
  well with a client in exactly the same version, with exactly the same
  OS.

  However, it does not work well with Unison 2.48.4-1ubuntu1 from Ubuntu
  18.04, or with Unison on other OSes.

  Once the client has determined the files that were updated, when I click on 'Go', the synchronisation fails with a message like this one: 
  > Fatal error: 
  > Uncaught exception Failure("input_value: ill-formed message")

  Sometimes there is the mention "possibly because client and server
  have been compiled with different versions of the Ocaml compiler."

  I have seen this issues in the following configurations
  - 2.48.4-4ubuntu1 on Ubuntu 20.04 LTS (client) and 2.48.4-1ubuntu1 on Ubuntu 18.04 LTS (server) => Fails
  - 2.48.? on Mac OS X (client) and 2.48.4-4ubuntu1 on Ubuntu 20.04 LTS (server) => Fails
  - 2.48.3 on Windows 7 (client) and 2.48.4-4ubuntu1 on Ubuntu 20.04 LTS (server) => Fails

  Note that the Mac OS and Windows clients were working well with unison
  2.48.4-1ubuntu1 (Ubuntu 18.04 LTS, server).

  Maybe my problem could be solved by reverting unison to the version
  2.48.4-1ubuntu1 from Ubuntu 18.04 LTS. Is is possible to do so with
  `apt install` on Ubuntu 20.04? Thanks!

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: unison 2.48.4-4ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 27 19:18:59 2020
  InstallationDate: Installed on 2020-04-16 (11 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  SourcePackage: unison
  UpgradeStatus: Upgraded to focal on 2020-04-21 (6 days ago)

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