Some interesting errors when I try setting accessibility settings in terminal both LightDm and Gdm in Precise

[Hammer Attila]

Hy,

I doed now with Ubuntu 12.04 installation, without manual partitioning.
I try look possible setting LightDm related a11y settings in terminal.
I try run sudo -u lightdm gsettings set org.gnome.desktop.interface 
toolkit-accessibility true command, but this command don't working.
Try similar command after I installed Gdm package, I simple run old sudo 
-u gdm gconftool-2 -s -t bool /desktop/gnome/interface/accessibility 
true command.

Look following error messages:
root at hammera-Satellite-L300:/home/hammera# sudo -u lightdm gsettings set 
org.gnome.desktop.interface toolkit-accessibility true

** WARNING **: Command line `dbus-launch 
--autolaunch=120a3815ba77631ec49d9a9b0000000e --binary-syntax 
--close-stderr' exited with non-zero exit status 1: No protocol 
specified\nNo protocol specified\nAutolaunch error: X11 initialization 
failed.\n

** WARNING **: Command line `dbus-launch 
--autolaunch=120a3815ba77631ec49d9a9b0000000e --binary-syntax 
--close-stderr' exited with non-zero exit status 1: No protocol 
specified\nNo protocol specified\nAutolaunch error: X11 initialization 
failed.\n
root at hammera-Satellite-L300:/home/hammera#

root at hammera-Satellite-L300:/home/hammera# sudo -u gdm gconftool-2 -s -t 
bool /desktop/gnome/interface/accessibility true

GConf-WARNING **: Failed to load source 
"xml:readonly:/etc/gconf/gconf.xml.system": Failed: Could not make 
directory `/etc/gconf/gconf.xml.system': Permission denied
Error setting value: Can't overwrite existing read-only value: Value for 
`/desktop/gnome/interface/accessibility' set in a read-only source at 
the front of your configuration path

root at hammera-Satellite-L300:/home/hammera# sudo -u gdm gsettings set 
org.gnome.desktop.interface toolkit-accessibility true

** WARNING **: Command line `dbus-launch 
--autolaunch=120a3815ba77631ec49d9a9b0000000e --binary-syntax 
--close-stderr' exited with non-zero exit status 1: No protocol 
specified\nNo protocol specified\nAutolaunch error: X11 initialization 
failed.\n

** WARNING **: Command line `dbus-launch 
--autolaunch=120a3815ba77631ec49d9a9b0000000e --binary-syntax 
--close-stderr' exited with non-zero exit status 1: No protocol 
specified\nNo protocol specified\nAutolaunch error: X11 initialization 
failed.\n
root at hammera-Satellite-L300:/home/hammera#

This is surprise, because I think the casper-a11y-helper script doing 
similar command for LightDm login manager, if the blindness profile is 
selected (access=v3 commandline parameter). Because have now this 
errors, during installation this commands runs, but not setting proper?
How can possible setting in LightDm the accessible login feature? Unity 
Greeter already supports it for screen reader function?

Attila