Dear Oldfred & Yancek,
problem solved, thank you!
What I did:
1. in the Ubuntu wiki Yancek linked I read the "Converting Ubuntu into Legacy mode" part. First point is
Code:
If Ubuntu is installed on a GPT disk (you can check it via the 'sudo parted -l' command), use Gparted to create a BIOS-Boot partition (1MB, unformatted filesystem, bios_grub flag) at the start of its disk.
but the drive seems not to be GPT. Hence, I marked as /boot the /dev/sda1 partition and removed the flags from sda6
2. With boot-repair I re-installed GRUB, this time it installed grub in the mbr, i.e. ok with legacy boot
3. The command
Code:
[ -d /sys/firmware/efi ] && echo "Installed in UEFI mode" || echo "Installed in Legacy mode"
returned correctly "legacy mode"
4. Reboot and entered bios, disabled uefi boot
5. Reboot, grub is there but no windows
6. boot-repair again, this time it detected windows too
7. reboot, ubuntu and windows are both selectable in grub!
Thank you!!!!
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