It looks like there is something wrong with your EFI system partition.
Can you take a look at what files are in it? Specifically is there an
"EFI" folder and does it contain an "ubuntu" one?
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1745574
Title:
Executing grub-install/dev/sda ntuubufailed while instaaling
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