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

[Russ Williams]

15 months later, this installer bug still exists?!

It is inherited by Linux Mint's installer and just caused me to waste a
lot of time and frustration websearching for info and a solution about
it when I was installing; my install failed (but in hindsight, for
another less obvious reason rather than the bogusly reported missing EFI
partition), and this bug needlessly sent me down a false trail. I agree
with Alkis that this false needlessly scary warning should be removed.
Especially given that Ubuntu and its derivatives purport to be more
user-friendly versions of Linux.

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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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