It looks like grub isn't recognizing the raid array. After activating
the array with mdadm, please run grub-probe -d /dev/md/boot -vvv -ddd
and post the output.
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1687183
Title:
17.04 grub installer crushed
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