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.


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