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

[Alkis Georgopoulos]

@guiverc thank you very much for testing; I'd like to comment on two
phrases above though:

> but that has been there for some time

It didn't happen in the last LTS release, 20.04.
It's the first time that LTS users see this regression.

> I'd expect most users will know if it applies

I guess you mean "Linux techinians and testers" there, because out of
e.g. 10.000 students and teachers here, I think less than 1% of them
will know if they've booted in BIOS or UEFI mode.

For the sake of normal users, this scary warning needs to be removed.

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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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