Another test... I added a background image to grub2, succesfully: fireworks.jpg (transformed the xpm included in the package). But now, after the two error messages ("cannot read linux header" and "you need to load kernel first") I obtain, after pressing a key and before returning to the menu, another error message: "caricamento delle voci predefinite e di ripiego non riuscito". Which might be approximately translated to English as follows: "impossible to load defaults". I hope that this can help debugging...
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