I think "gconftool-2 --set --type bool /desktop/gnome/lockdown/disable_lock_screen True" in guest-account can be replaced by the script attached in comment #31 or something similar since gconf should be replaced by gsettings.
I think "gconftool-2 --set --type bool /desktop/ gnome/lockdown/ disable_ lock_screen True" in guest-account can be replaced by the script attached in comment #31 or something similar since gconf should be replaced by gsettings.