I'm remastering the ubuntu CD, I've changed some files in the isolinux folder (access.pcx, blank.pcx, gfxboot.cfg) and I have been able to change the first screen (background color to green):
But I can't change the second screen.
I made my own plymouth-theme package, and removed the plymouth-theme-ubuntu-text package. But this standard ubuntu screen is still displayed.
After installation, my own plymouth theme is well displayed.
So, I'm lost, is this screen related to plymouth? (if so, how can it be displayed after removing plymouth-theme-ubuntu-text) Or is it another file to modify?