Hi, Mario Marietto wrote: > Finally I found something that's very close to the solution : > https://askubuntu.com/questions/1228909/preseed-config-using-cubic-is-ignored-during-installation
If this shall be the solution then the files to change would probably be isolinux/menu.cfg boot/grub/grub.cfg The isolinux configuration serves when booting by legacy BIOS or EFI legacy mode. For booting via EFI native mode you need to modify the grub configuration. Have a nice day :) Thomas