Can you please try again, and when you get to the point of this failure,
open a terminal and run the following commands and paste the output:
sudo chroot /target
grub-probe -vv /
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1309639
Title:
Installer locks after failing to install GRUB onto RAID array
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