There appears to be a local configuration/state issue:
mdadm: /dev/md does not appear to be an md device
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2083626
Title:
package grub-pc 2.12-1ubuntu7 failed to install/upgrade: installed
grub-pc package post-installation script subprocess returned error
exit status 1
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