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

[sudodus]

The current Lubuntu Groovy iso file

$ ls -l groovy-desktop-amd64.iso
-rw------- 1 sudodus sudodus 1894162432 okt 13 16:56 groovy-desktop-amd64.iso

$ sha256sum groovy-desktop-amd64.iso
2bc2b6bf2a14a4a293ce5280e754ed9ef4913873a529c99bfe0bcfe222aff2b5  groovy-desktop-amd64.iso

when cloned does *not* boot in my son's HP Elitebook 8560p but it boots
in the Lenovo V130.

This does *not* match the behaviour of the current Ubuntu Groovy iso
file, that works also in the HP Elitebook 8560p.

-o-

The current Lubuntu iso file '20201013' was created later than that of
Ubuntu '20201013.1', but the number in the ISO tracker is lower. So I
guess that the Lubuntu iso file lacks the final tweak of the boot
structure (adding mbr flag:  --mbr-force-bootable).

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

Title:
  failure to boot groovy daily  (again)

Status in Ubuntu CD Images:
  Fix Released
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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