[Bug 1668148] Re: Booting installer in EFI mode with existing bios mode hd crashes

[Alloix]

I just fall myself in this case and I think this example and my reflection can help this discussion ...
(Why do I think that you need not only a message, but also a choice box (legacy / efi) when installing ...)

My bios has efi disabled. I configured my boot start without efi with:
1 - cd / dvd
2 - usb
3 - HDD
and I just realized that as soon as I touch this config, it automatically duplicates my choices for devices in:
4 - cd / dvd efi
5 - usb efi
when I start with a cd or a usb key, it goes into auto boot and start directly by switching to 4 or 5 (!). Basically it forces the boot efi even if it is disabled and even if you have filled something else manually ...
that's how I got an "install failed"

If I start by doing F(4-5-6-7...) for boot option: no pb: I have my
order manually filled (+ the duplicate choices in efi)

I have an ASUS with a bios update (but seeing what I read on the forums,
it must not be the only ones to force the efi this way ...)

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https://bugs.launchpad.net/bugs/1668148

Title:
  Booting installer in EFI mode with existing bios mode hd crashes

Status in partman-efi package in Ubuntu:
  Triaged
Status in partman-efi source package in Artful:
  Triaged

Bug description:
  When installing in EFI mode to a disk that is partitioned without an
  EFI system partition, you do get a warning message that this may cause
  a problem and suggests that you go back and do a bios mode install
  instead.  The way that it is worded, and the fact that the button to
  switch to a BIOS mode install is labeled "cancel", is very confusing
  and has lead to hundreds, if not thousands of users clicking the OK
  button instead, and proceeding with an install that is doomed to fail.
  This message really needs to be clarified.

  Instead of clarifying, the question was removed, and grub-efi is
  always used, which crashes the install.  grub-pc is the correct
  version to use in this case.  This is a release regression that needs
  corrected for 18.04.1.

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