Most curious. It would be of tremendous help if you could find another
application that behaves like that, one that is opensource and part of
the ubuntu archive preferably.

DISPLAY being set to, for example, localhost:10.0, is indicating that
the X alls are going through ssh in that particular case. It's setup by
the -X parameter.

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https://bugs.launchpad.net/bugs/1726595

Title:
  Running Matlab (R) from ssh session with X forwarding doesn't work
  anymore in 17.10

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  OBSERVED BEHAVIOR:
  Matlab stays in busy state when using some functions like "plot" or even 
"exit", while executing through a ssh tunnel with X11 forwarding. 

  REPRODUCE THE BUG:

  You need matlab (my version is R2017a) to reproduce the bug. I suspect
  any version >= 2014b would reproduce the bug (HG2 framework), and
  maybe any version.

  1. Connect to self (or from other machine) with X forwarding:
  $ ssh -X user@localhost

  2. Launch matlab
  $ matlab &

  3. Plot something
  >> plot(1,1)

  ADDITIONAL INFORMATION
  - Normal behavior would be appearance of a new window and a single point at 
position (1,1). 
  - No ressources seem to be used. 
  - Opening a figure alone is possible. (>> figure). Opening other windows from 
the graphical user interface is possible 
  - Opening Matlab without the java machine seems to work, but matlab relies 
heavily on java. At least "exit" which doesn't work with java, works without 
java.
  - Providing Matlab with open-jdk version 1.8.0_144 didn't change anything.
  - This used to work perfectly for as long as I have been using Ubuntu (since 
2012).

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: openssh-client 1:7.5p1-10
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Mon Oct 23 17:44:23 2017
  ExecutablePath: /usr/bin/ssh
  InstallationDate: Installed on 2017-08-25 (59 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  RelatedPackageVersions:
   ssh-askpass       N/A
   libpam-ssh        N/A
   keychain          N/A
   ssh-askpass-gnome N/A
  SSHClientVersion: OpenSSH_7.5p1 Ubuntu-10, OpenSSL 1.0.2g  1 Mar 2016
  SourcePackage: openssh
  UpgradeStatus: Upgraded to artful on 2017-10-23 (0 days ago)
  modified.conffile..etc.ssh.ssh_config: [modified]
  mtime.conffile..etc.ssh.ssh_config: 2017-10-23T16:25:50.569560

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