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[Jeff Abrahamson <1882130@xxxxxxxxxxxxxxxxxx>]

This may be a duplicate of #1868502 which is potentially related to
#1568459.

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https://bugs.launchpad.net/bugs/1882130

Title:
  Unison in 20.04 won't talk to older unison

Status in unison package in Ubuntu:
  New

Bug description:
  I'm running unison 2.48.4 on two hosts.  One I just upgraded to 20.04.
  The other is still at 18.04 LTS.  The two unison instances no longer
  talk happily together.  The error is this:

  Fatal error: Server: Fatal error during unmarshaling (input_value: ill-formed message),
  possibly because client and server have been compiled with differentversions of the OCaml compiler.

  which is repeated many times.

  It seems quite surprising that the issue is really only resolvable as
  "upgrade all unison instances that might ever talk to each other
  together or not at all", so I suspect the error message about OCaml
  build is a red herring.  I'm not, however, sure how to debug this,
  however.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: unison 2.48.4-4ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
  Uname: Linux 5.4.0-33-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: i3
  Date: Thu Jun  4 21:35:59 2020
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-10-23 (1686 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: unison
  UpgradeStatus: Upgraded to focal on 2020-06-04 (0 days ago)

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