Unfortunately with Unity you have the same issue. Canonical has dropped
Unity-2d support so that's a problem with X2go (and NX) as well.

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On Wed, 8 Apr 2015, Heng Zhou wrote:

Date: Wed, 8 Apr 2015 22:12:20 -0400
From: Heng Zhou <hzhou1@cs.uml.edu>
To: Robert Dinse <nanook@eskimo.com>
Cc: x2go-user <x2go-user@lists.x2go.org>
Subject: Re: [X2Go-User] GNOME and Unity can not launch

Thank you for the reply. gnome-shell --version reports 3.10.4 and
gnome-session --version returns 3.9.90 with no composite extension in the
server. I am not an administrator of the remote server, so it seems that I
have to give up gnome. What about Unity then? It's the default GUI for
ubuntu.

PS: Mate desktop works but I don't know how to play with it.


On Wed, Apr 8, 2015 at 8:28 PM, Robert Dinse <nanook@eskimo.com> wrote:

     If the server is a modern Linux with Gnome 3 this will happen because
Gnome 3 uses a compositing desktop not compatible with X2Go.

     For me the fix was to install Mate desktop on the servers which is a
fork of Gnome 2 and is compatible with X2Go.

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 Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting.
   Knowledgeable human assistance, not telephone trees or script readers.
 See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874
.

On Wed, 8 Apr 2015, Heng Zhou wrote:

 Date: Wed, 8 Apr 2015 19:43:02 -0400

From: Heng Zhou <hzhou1@cs.uml.edu>
To: x2go-user@lists.x2go.org
Subject: [X2Go-User] GNOME and Unity can not launch


Hi,

I installed the latest X2Go client, but it only works with KDE. When I
tried to launch Unity and GNOME desktop, they always fail. To be specific,
when I selected Unity, the desktop just flashes and disappear. When I
selected GNOME, I got a black desktop window and VcXsrv reports an error
saying "Cannot establish any listening socket - make sure an X server
isn't
already running". The contents of VCXSrv.0.log is:

_XSERVTransSocketCreateListener: failed to bind listener
_XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for
inet6
_XSERVTransSocketCreateListener: failed to bind listener
_XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for inet
(EE)
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't
already running(EE)
(EE) Server terminated with error (1). Closing log file.

I have no idea how to check if any X server is running on my computer. All
the settings of X2Go are default. The remote machine is ubuntu 14.04. Any
help? Thanks.