Re: [gnome-flashback] gnome-sessions on Ubuntu 15.10+

[Alkis Georgopoulos <alkisg gmail com>]

I gave it a try under 16.04 by first manually running xterm from x2go, 
then manually setting all the appropriate environment variables like 
XDG_CURRENT_DESKTOP, DESKTOP_SESSION etc, and finally running:

/usr/lib/gnome-flashback/gnome-flashback-metacity 
--disable-acceleration-check --debug

This gave me the following (partial output), which leads me to believe 
that it's a xorg issue?

Maybe gnome-flashback session now requires the composite extension?


...
gnome-session-binary[18235]: DEBUG(+): App gnome-panel.desktop registered
gnome-session-binary[18235]: DEBUG(+): GsmManager: ending phase PANEL
gnome-session-binary[18235]: DEBUG(+): GsmManager: starting phase DESKTOP

gnome-session-binary[18235]: DEBUG(+): GsmManager: starting app 
'/org/gnome/SessionManager/App2'
gnome-session-binary[18235]: DEBUG(+): Starting app: 
/org/gnome/SessionManager/App2
gnome-session-binary[18235]: DEBUG(+): GsmAutostartApp: starting 
gnome-flashback.desktop: command=gnome-flashback 
startup-id=10a9a085719530afe3145012055212866100000182350001
gnome-session-binary[18235]: DEBUG(+): GsmAutostartApp: started pid:18275

(gnome-flashback:18275): Gdk-ERROR **: The program 'gnome-flashback' 
received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadRequest (invalid request code or no such operation)'.
  (Details: serial 111 error_code 1 request_code 149 (RANDR) minor_code 25)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() 
function.)
gnome-session-binary[18235]: DEBUG(+): GsmAutostartApp: (pid:18275) done 
(signal:5)
gnome-session-binary[18235]: WARNING: Application 
'gnome-flashback.desktop' killed by signal 5
gnome-session-binary[18235]: DEBUG(+): Re-starting app: 
/org/gnome/SessionManager/App2
...

Cheers,
Alkis