Maybe your clear explanation should be given by the system rather than a quite
misleading error message ?
Thanks for your greatly appreciated help all the same ;-)
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You are trying to install grub to a disk partitioned with GPT. To do
this you either need to create a 1 mb bios_grub partition to boot in
bios mode, or a 100mb EFI system partition to boot in EFI mode.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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