Fix to ubiquity

[Hammer Attila]

I do a custom live CD and test the new modifyed version.
When the desktop exec line is not containing sudo prefix, the installer 
is not launched if I click the desktop icon.
I copyed the command line with desktop file, and running with terminal. 
sudo give a invalid switch error message.
If I add sudo prefix with installer desktop properties with command 
field, all works fine, Orca is wonderful talking entire installation
Sending a modifyed patch with fixing Bill wroted two problem, and modify 
the needed desktop.in file with the source directory. Tomorrow I test 
the modifyed version with containing bot three changes.

Attila
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