Dunno if my bug is the same. It was from an Ubuntu Gnome install.

https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1446459

When installing to /sdb/, installer encounters fatal error when
attempting to run grub-installer

I tired altering the drive to /sda/ through UEFI priorities but to no
avail.

So I unplugged the second storage drive which was getting defined as
sda.

RESOLUTION
With only one drive plugged in, it was forced as sda

grub-installer ran without issue
installer completed successfully

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https://bugs.launchpad.net/bugs/1426905

Title:
  grub's prerm script fails, preventing installation of vivid Ubuntu-
  MATE

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