[X2Go-Dev] GNOME vs. Unity on Ubuntu precise

[Stéphane Graber]

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On 04/29/2012 12:22 AM, Mike Gabriel wrote:
> Hi all,
> 
> with Ubuntu precise launching an X2Go session named ,,GNOME''
> results in a UNITY-2D desktop session.
> 
> First thing: it is nice to have Unity available via X2Go.
> 
> Second thing: it is a PITA that starting ,,gnome-session'' ends up
> with the UNITY shell. If we say GNOME in the client we should end
> up with GNOME(3).
> 
> @devs: ------ Currently, the client-side translates the session
> profile <command> (GNOME, KDE, ...) into the server-side command
> (gnome-session, startkde). For single applications this translation
> is done within x2goruncommand.
> 
> I would like to suggest to move this translation into
> x2goruncommand completely. Allowing the server-side to detect what
> actual command has to be executed for ,,GNOME'' or ,,KDE'' or
> <OTHER> will be much more handy than making the client-side aware
> of the server's operating system, shell, Xsession files, etc.
> 
> Your opinions, please!!!
> 
> Greets, Mike

To solve the problem properly, you'd need something that understands
gnome-session and uses it as it's expected.

Here are some example calls of gnome-session:
 - gnome-session => starts the default session, on Ubuntu, unity-3d
 - gnome-session --session=ubuntu => starts unity-3d
 - gnome-session --session=ubuntu-2d => starts unity-2d
 - gnome-session --session=gnome => starts Gnome3 (shell)
 - gnome-session --session=gnome-fallback => starts the gnome 3.x
fallback session


The names match entries in /usr/share/gnome-session/sessions/

It's also generally recommended to start these sessions through
/etc/X11/Xsession or some things won't be set properly (gconf/dconf
profile being the most annoying one).

I'm usually using:
export DESKTOP_SESSION=gnome-fallback
/etc/X11/Xsession "gnome-session --session=$DESKTOP_SESSION"

This simulates what gdm/lightdm do and make all the Xsessions script
do the right thing and finally calling gnome-session with the right
session.
(DESKTOP_SESSION is used by gconf to change the default settings
depending on the session).


Hope that helps you get a clear picture of how that all works and let
you get good support for that in x2go. I had to dig into that lately
when fixing some bugs in LTSP and in Weblive (with both x2go and NX).

- -- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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