Thank you Phillip! I eventually worked this out and created an EFI
system partition ... and this worked like a dream!
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https://bugs.launchpad.net/bugs/1781302
Title:
Grub will not inst
Your disk is currently partitioned to boot in bios mode, but you booted
the installer in EFI mode. You either need to boot the installer in bios
mode, or partition the disk using GPT and set up an EFI system partition
to install in EFI mode. This will be done for you if you choose the "use
entire d