My question is quite simple. Where all do we use the file warty-final-ubuntu.png ? Or at which all places do we need the file warty-final-ubuntu.png to be intact.
My question is, not to find the locations of the file. I actually meant to find where all is it used.

How is it possible to change the warty-final-ubuntu.png that is shown when ubiquity installer is displayed to some other images ?

Another question related to plymouth theme. Is it possible to replace the pink purple colour of Ubuntu's default plymouth theme with an image?