It turns out that mdadm had been uninstalled some two weeks prior to the
most recent upgrade and so grub-install had no user space tools to query
the RAID arrays. Reinstating mdadm fixed the problem.

** Changed in: grub2 (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1759877

Title:
  grub-pc fails to upgrade with raid disks

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