Automatically choose "Try Ubuntu without Installing" after booting from USB Startup Disk

I have created a usb bootup stick for 10.10, and reduced the timeout to 0 sec... but after it boots up it shows two options either to install or try ubuntu... I want to avoid this screen and directly go to the tryout mode...

at the first screen at bootup if I press any key,there is an option to select "try Ubuntu without installing",in this case I go to tryout mode directly... I want this behaviour without pressing any key...

any suggestions???

Thanks.

Solution 1:

I'm not really sure what you want, but if you want it to behave this way you should install Ubuntu on the usb disk rather than installing the Live-CD on it.