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

[Chris Guiver]

A discussion on IRC with alksig mentioned this bug report yesterday, so
I tested for it

Ubuntu-MATE jammy ISO (20220715; ie. daily of 22.04.1) install to
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

Manual partitioning, select the one partition that was created yesterday
by a Lubuntu jammy (daily) install; ie. /dev/sda1 for /; WITH format.
ie. box has no ESP or efi system partition

Result is clean install; reboot & all looks good.
No issues with this issue.

YES there was a warning (during installation; yesterday with Lubuntu
too), but that has been there for some time, I know and expect it; and
know this box from 2005 will not be impacted thus it doesn't worry me.

I'm aware some install circumstances do NOT cause the warning to show,
others (& most) do; but to me at least, it's not an issue. I'd expect
most users will know if it applies, or given this box is old & pre-dates
EFI box it doesn't. Further the drive could be moved post-install to
another box where it IS an issue; the warning covers that too (I see
many people in support do this; and I've seen it done in real life too).
I have no issue with the warning.

http://iso.qa.ubuntu.com/qatracker/milestones/429/builds/253283/testcases/1302/results/

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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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