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[Launchpad Bug Tracker <1463263@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: mir (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment forwarding mir x11
-- 
X11 Forwarding is broken following upgrade to Ubuntu Server 15.04 from 14.10
https://bugs.launchpad.net/bugs/1463263
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