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

[Chris Guiver]

Thank you @Thomas Schmitt (scdbackup) & @sudodus

Using today's Lubuntu groovy ISO 2020.10.12, I ran
(based on @sudodus' comment #15)
--
#!/bin/bash
  original=groovy-desktop-amd64.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=gpt \
    -boot_image any mbr_force_bootable=on
--
to create new 'test_mbr.iso'.  It was written with
`sudo dd if=test_mbr.iso of=/dev/sdb bs=4M oflag=sync

it booted fine on (not impacted by this bug)

hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600)
dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)
dell [optiplex] 755 (c2d-e8300, 8gb, amd/ati radeon rv610/radeon hd2400 pro/xt)
(it appeared to boot slow on 755-8 or 2nd 755, but subjective)
dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

HOWEVER it did NOT boot on

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

Please feel free to verify what I did & highlight any mistakes. 
(keep instruction dead-simple for me please)

-- 
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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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