On Sat, 11 Jan 2020 09:59:43 +0000 (UTC) Joerg Lechner via users users@lists.fedoraproject.org wrote:
Hi,tried to install F30 and F31 on 2 separate Partitions on 1 external disk, no success, got either only F30 and Windows boot (internal disk is Windows 10) or F31 and Windows boot. Did anyone install 2 Fedora versions on 1 disk in seperate partitions? Grub shows after installation either F30 and Windows, or F31 and Windows. Kind RegardsJoerg
From a discussion on this list last year, it is my understanding that UEFI does not allow that. It's because the /boot/efi/EFI/fedora partition can only contain one fedora OS. Chris Murphy offered some potential workarounds in that thread, but if I recall, they were not simple. I think one of them was to use systemd to boot, but I don't recall the details.