Hello, On 30/03/2023 at 01:21, Dima Kogan wrote:
I'm installing from a USB drive. To make this work, I had to turn off secure-boot and UEFI in the BIOS.
Why ? What happens if UEFI boot is enabled ? How did you prepare the USB drive ? What installation image did you use (full file name and URL please) ?
Some searching tells me this is because GPT partitions are required for UEFI booting
There is no such requirement in the UEFI specification. UEFI boot supports either GPT or MSDOS.
I'm not 100% sure of the exact cause. But I suspect strongly is that booting the install media without UEFI broke installing to an UEFI-only disk.
If the installer was booted in BIOS/legacy mode, it installed GRUB for legacy boot.