Fix to ubiquity

[Hammer Attila]

Dear Bill,

With bksu/sudo modification, possible not simplest modify only the 
/usr/share/applications/ubiquity-gtkui.desktop file with exec line? For 
example, when I do custom live CD, I modifyed the following line in the 
live CD extracted chroot file system, and working right:
Exec=sudo ubiquity --desktop %k gtk_ui
I tryed this method, and Orca does'nt silent entire installation.

Attila