On Sat, 9 Nov 2019 00:36:04 +0200
Kad Zayar via users <users@lists.fedoraproject.org> wrote:

> Does that mean that the install media should appear in my uefi boot
> menu as (at least) two entries? Or are we talking about the grub menu
> that appears *after* booting from the flash drive?

Yes to the first question, an EFI entry and an MBR entry.  No to the
second, this is the firmware boot menu that is present when the
firmware is UEFI.

> After booting I can confirm whether the install media is in uefi mode
> by checking if /sys/firmware/efi exists, right?

I don't know the answer to your question.  On my system that secure
boots EFI that directory is present, for what it is worth.  I think the
correct way to do this is to use efibootmgr.  I'm not sure because I
always turn off rhgb and quiet in the kernel boot options, have a
delay enabled, and then there is a message something like 'EFI stub.
Secure boot enabled' displayed, before the grub menu comes up.  You can
get to a menu to edit the install menu boot stanza by hitting space
while the media is booting.  I think the new default for Fedora is to
have no wait in order to make the boot pretty, so it is tricky and you
have to continually hit space in order to hit the window when it is
looking for input.

As root, if you type 
efibootmgr -v
you should show the currently booted device, and if it is EFI there
should be something like 'EFI/FEDORA/shim64.efi at the end.
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