Comment 50 for bug 1886148

Lubuntu groovy daily 2020-07-13 (identical file as per #49)

I used (due comment #47) `Startup Disk Creator` on my main box to write this media and it's still failing on

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

The media is good, booting normally (passing checks) on
dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)

On both old HP boxes I get bright/faster pattern of flashes on the thumb-drive very briefly on selecting USB DEVICE for booting, then I get the hdd's grub menu appear and flashing on thumb-drive returns to normal as if BIOS/box firmware gave up on usb-media.

In my opinion, media written via `dd`, `mkusb` & `Startup Disk Creator` is identical (I don't use persistence or options in QA-testing so simple 'live' media with mkusb/dus)

No change to prior attempts since this bug was discovered on the dc7700 & dc7900, except initially it failed to boot on most if not all my boxes when initially reported.