I found another mode in which the current groovy iso files make bootable
drives: 'grub-n-iso' alias isoboot. I can make a bootable USB drive that
boots

- both in UEFI and BIOS mode
- both live-only and persistent live

when booting into a 'grub template' and then into an iso file according
to the following link,

https://help.ubuntu.com/community/Installation/iso2usb/isoboot

So this 'grub-n-iso' method works, but a cloned drive from the sane iso
file fails (when tested in the same Dell Precision M4800 as used for the
tests described above).

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https://bugs.launchpad.net/bugs/1886148

Title:
  failure to boot groovy daily

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