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[Cemil Azizoglu <cemil.azizoglu@xxxxxxxxxxxxx>]

** Changed in: mir (Ubuntu)
     Assignee: (unassigned) => Chris Halse Rogers (raof)

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https://bugs.launchpad.net/bugs/1463263

Title:
  X11 Forwarding is broken following upgrade to Ubuntu Server 15.04 from
  14.10

Status in mir package in Ubuntu:
  New

Bug description:
  More detail posted here:
  http://ubuntuforums.org/showthread.php?t=2281659&p=13300597

      surfrock66@sr66-blade:~$ lsb_release -rd
          Description:	Ubuntu 15.04
          Release:	15.04

  I performed an in-place upgrade from 14.10 -> 15.04. Now, GTK apps
  will not X11 forward. I was under the impression that Mir would not be
  in place until 15.10 which was when I would have probably held back on
  upgrading; I believe that other gtk packages have been modified with
  hooks in preparation to support Mir, and that these updates have
  broken X11 forwarding

  Some sample command output from the client I am using to connect from:

      surfrock66@sr66-blade:/$ easytag
          gdk_mir_display_open
          Failed to connect to Mir: Failed to connect to server socket: No such file or directory
          Unable to init server: Could not connect: Connection refused
          (easytag:13278): Gtk-WARNING **: cannot open display:
      surfrock66@sr66-blade:/$ baobab
          gdk_mir_display_open
          Failed to connect to Mir: Failed to connect to server socket: No such file or directory
          Unable to init server: Could not connect: Connection refused
      surfrock66@sr66-blade:/$ gedit
          gdk_mir_display_open
          Failed to connect to Mir: Failed to connect to server socket: No such file or directory
          Unable to init server: Could not connect: Connection refused
          (gedit:13348): Gtk-WARNING **: cannot open display:

  The server does have an X session running, and I can X11 forward from
  other devices so I know my client (X11 server) works.

  I've done some research:
  http://ubuntuforums.org/showthread.php?t=2266456
  http://ubuntuforums.org/showthread.php?t=2256737

  x2go still works, but X11 forwarding was a huge part of my workflow
  and I'm extremely ticked off, I've been trying to troubleshoot it
  since the day 15.04 came out.

  Host server is my home server; a Dell poweredge SC 1425 in my server
  closet.

  I ran tried from 3 clients, got the same results on each:
      Debian Sid laptop over the LAN, ssh session using a shortcut created when it was working on 14.10
      Windows work laptop using Cygwin over the WAN, ssh session using a shortcut created when it was working on 14.10
      Windows work laptop using MobaXterm over the WAN, fresh ssh session.

  All 3 clients can successfully run an X11 forwarded client from
  another computer (all 3 were my System76 desktop running from my
  house)

  I have an alias to connect to my server; the command is "ssh -p ####
  -X IP" and in that, "echo $DISPLAY" returns a blank line. If I get
  into the server over x2go or VNC, "echo $DISPLAY" returns :0.

  On my laptop (the client machine, with the X11 Server):

      surfrock66@sr66-darter:~$ egrep -i forward /etc/ssh/sshd_config
          X11Forwarding yes
      
  On the server (the X11 client):

      surfrock66@sr66-blade:~$ egrep -i forward /etc/ssh/sshd_config
          X11Forwarding yes

  From this client laptop, I invoke X-11 forwarded apps in 2 ways; the
  aliased ssh connection string, and from a shortcut in my awesomeWM
  menu. Here's the strings for both (I blocked the port numbers):

      # SSH Shortcuts
      alias hda='ssh -p #### -X hda.surfrock66.com'
      alias mc='ssh -p #### teh3l3m3nts@xxxxxxxxxxxxxxxxxx'
      alias sr66-darter='ssh -p #### -X 192.168.1.65'
      alias sr66-dell='ssh -p #### -X 192.168.1.47'
      #alias sr66-hp='ssh -p #### 192.168.1.10'
      alias sr66-hp='ssh -p #### -X sr66-hp.hda.surfrock66.com'
      alias sr66-nas='ssh -p #### surfrock66@192.168.1.36'
      alias sr76='ssh -p #### -X sr76.hda.surfrock66.com'

  All of them are initiating client sessions that should permit X11
  forwarding. Now for the AwesomeWM shortcuts:

  myhdaforwardedapps = {
  	{ "Baobab", "xterm -e 'ssh -X -p ### surfrock66@192.168.1.22 -t baobab'" },
  	{ "EasyTag", "xterm -e 'ssh -X -p ### surfrock66@192.168.1.22 -t easytag'" },
  	{ "File Manager", "xterm -e 'ssh -X -p ### surfrock66@192.168.1.22 -t pcmanfm'" },
  	{ "Terminator", "xterm -e 'ssh -X -p ### surfrock66@192.168.1.22 -t terminator'" },
  }

  All of these shortcuts worked before the upgrade.

  I am happy to provide any additional information.

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