An update to the situation.
1. I reconfirmed the valid checksum of the ISO file used - yep all
good.
2. I erased and reformatted the USB used to restore the ISO file to, in the
failed install.
Note that it was a brand new 32GB device used in the first attempt.
3. Restored the ISO file to this device and did not set it up for persistence.
Just a straight bootable Live USB with Ubuntu 20.04.
4. Booted from the USB and went straight to the install stage.
Did not 'try' (or road test) the software (which I had previously).
5. Selected the option to wipe the partially completed, failed
install.
6. Magic happened, and the install worked successfully, as expected.
Dual boot works as expected.
7. I do not know where or what the initial problem may have been.
Try Live with persistence?
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https://bugs.launchpad.net/bugs/1887776
Title:
install of 20.04 from live USB with presistance for acer swift 5 i7
laptop dual boot with win10 failed at grub2 uefi
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