[Bug 1899308] Re: failure to boot groovy daily (again)

[sudodus]

This morning (CET) I tested a cloned system from a modified iso file
according to Thomas Schmitt;

  original=groovy-desktop-amd64_20201010_gpt.iso

  test -f test_mbr.iso && rm test_mbr.iso

  xorriso \
    -indev "$original" \
    -outdev test_mbr.iso \
    -boot_image any replay \
    -boot_image any appended_part_as=mbr

in the HP Elitebook 8560p. With an external monitor and in recovery mode
I could get it to the desktop. Actually it is enough for this debug task
to get it to the grub menu, which fails with the original iso file
because of the GUID partition table.

So I am sure that we have identified the problem. Thomas Schmitt's
method is a second work-around, more direct and maybe more convenient
than creating a persistent live drive with mkusb.

A solution would be to revert to the boot structure of 20.04.x LTS,
which provides iso files that boot for all Ubuntu family iso files in
all amd64 type computers, that we have tested.

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https://bugs.launchpad.net/bugs/1899308

Title:
  failure to boot groovy daily  (again)

Status in Ubuntu CD Images:
  New
Status in cd-boot-images-amd64 package in Ubuntu:
  Confirmed

Bug description:
  This is either a duplicate or return of
  - https://bugs.launchpad.net/ubuntu-cdimage/+bug/1883040
  - https://bugs.launchpad.net/ubuntu-cdimage/+bug/1886148

  Most probably "groovy daily won't boot anymore on some older BIOS
  boxes" or the 1883040 bug, as it's impacting only my older slow boxes
  (but it's also different).

  thumb-drive has been successfully used in QA live & install tests,
  however it won't boot on

  hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
  hp dc7900 (c2d-e8400, 4gb, intel 4 series integrated i915)

  The last timing issue also impacted d755-5 (older dell optiplex 755)
  when dc7700 was impacted, but that booted successfully this ISO.

  I see thumb-drive flash as it tries to boot, eventually it stops
  flashing, but no boot. At least 6 attempts made to boot, thumb-drive
  being tested on another 2x d755 boxes..

  (ISO written by mkusb/dus & gnome-disks [#11] is identical)

  ** Expected result

  It boots & is usable

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