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

[Cédric M. Campos]

Yesterday I installed the most recent point release, 22.04.1, on an old
computer with BIOS/MBR. I manually partitioned the disk (no EFI)
beforehand to then install. The installation program issued the
aforementioned warning. This did not happened with 20.04 (or 18.04) that
I recall.

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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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