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[matlantis <1568459@xxxxxxxxxxxxxxxxxx>]

In kubuntu 20.04 beta from today I have the problem that can't
synchronize to 18.04s unison, despite the fact, that both system run
unison in the same version 2.48.4.

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.

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https://bugs.launchpad.net/bugs/1568459

Title:
  unison incompatible with older ubuntu/debian versions

Status in unison package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  16.04 comes with a new version of unison, which is great.

  Unfortunately, it comes just with that new version, not older ones.
  Unison can synchronize only with precisely the same version on the
  peer, not interact with others. Therefore a 16.04 machine cannot sync
  to any older linux (ubuntu,debian,...), especially not to servers
  running 14.04.

  Older versions of ubuntu therefore came with different versions of
  unison, i.e. at least the version of the last LTS version to keep it
  functional and to have new clients work with older (but still
  supported) LTS servers.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unison 2.48.3-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Sun Apr 10 10:20:04 2016
  Dependencies:
   gcc-6-base 6-20160405-0ubuntu1
   libc6 2.23-0ubuntu2
   libgcc1 1:6-20160405-0ubuntu1
  SourcePackage: unison
  UpgradeStatus: Upgraded to xenial on 2016-04-06 (4 days ago)

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