Am 27.01.2024 um 19:03 schrieb fran...@libero.it:
> (it is a long report)
This is interesting ... BUT i lack the required experience:
Neither do i use Windows nor a notebook, but i would guess, that the
last paragraph from your report contains the root cause of your problem:
> Please do not forget to make your UEFI firmware boot on the Debian GNU/Linux
> 12 (bookworm) entry (sda1/efi//shim.efi ( will be updated in the
> final message) file) !
> If your computer reboots directly into Windows, try to change the boot order
> in your UEFI firmware.
>
> If your UEFI firmware does not allow to change the boot order, change the
> default boot entry of the Windows bootloader.
> For example you can boot into Windows, then type the following command in an
> admin command prompt:
> bcdedit /set {bootmgr} path \EFI\\shim.efi ( will be updated in
> the final message) >
As you already found by yourself, both systems are setup to be bootable
in uefi mode, and uefi by default has some way of making a choice
(either at boot time of through changing the boot order permanently)
GRUB is not strictly necessary for this to happen, but it can be used in
the mix. What would be very good to know, is, how is your firmware
manufactured and what does it allow? How does it cooperate?
If you want to get a better understanding of the UEFI boot process (with
or without grub), i recommend reading the documentation at
https://www.rodsbooks.com/linux-uefi/
good luck
