Ubuntu Kiosk
 

Hello, I am a total linux noob and I am trying to build a kiosk with ubuntu. I installed the ubuntu desktop version and got firefox to start automatically in fullscreen mode. But now I would like X server to start firefox without gnome to make it perfect. How could I do that. Every time I start X server it starts gnome also.

You have to edit your startx file (which is a script actually) to launch directly Firefox instead of the window manager. You will not have a window title bar, and exiting X will also need ctrl-alt-backspace (quite harsh). A cleaner solution is to make fluxbox or some similar window manager your default X environment - having a fullscreen Firefox on top of that keeps control intact.

Linux Archive

But how would I now change this startx file? And where is it?

Use your favourite text editor but make sure you run it as root or else use sudo: ex. It's usually in /usr/bin.
cheers,
jdk