Hi again.
Before decide to break the pc i managed to fix the problem, so i post the solution here for someone else.
First I Downloaded Grub-Customizer:
Code:
sudo apt-add-repository ppa:danielrichter2007/grub-customizer
sudo apt update
sudo apt install grub-customizer
then open it and in the "appearance customization" tab activate the checkbox "Customize Resolution" and set it to 1024x768 or another resolution that you see convenient
later open the "advanced options" (lower right button) and add a new entry with name = "GRUB_GFXPAYLOAD_LINUX" and value = "auto" then set active and close the dialog. Now hit the button "save" and exit the app.
In the next boot plymouth will work. If you want to personalize it download plymouth-manager.
Thanks for reading! regards!
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