[Bug 1951674] Re: Incorrectly warns "No EFI System Partition was found" on BIOS/MBR

[Michelle Cummings]

The warning about a missing EFI System Partition during an Ubuntu MATE
22.04 installation in BIOS/MBR mode is misleading because the system is
not actually using UEFI, so an EFI partition is unnecessary and the
installer should detect the absence of /sys/firmware/efi and an MBR
layout before showing such a message, as it may confuse new users into
thinking their setup is wrong when it is actually valid; this kind of
unnecessary alert is similar to how some websites clutter simple tasks
with irrelevant prompts, which is why when downloading lightweight apps
like the rbtv77 apk: https://rbtv77plus.app/ for free streaming from
trusted sites, it is important that the page remains clear and
straightforward so users can complete the download without confusing
warnings or misleading messages.

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https://bugs.launchpad.net/bugs/1951674

Title:
  Incorrectly warns "No EFI System Partition was found" on BIOS/MBR

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  While installing Ubuntu MATE 22.04 under BIOS mode, I select manual
  partitioning and I create an MBR disk with a single ext4 partition.
  Then I get a dialog with this warning:

  """
  Go back to the menu and resume partitioning?

  No EFI System Partition was found. This system will likely not be able
  to boot successfully, and the installation process may fail.

  Please go back and add an EFI System Partition, or continue at your own risk.
  """

  That dialog is inappropriate there and may scare inexperienced users.
  Ubiquity could check that /sys/firmware/efi doesn't exist, and that
  the disk is formatted with MBR, and not display that dialog.

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