Can you run the following commands and provide their output:
sudo mdadm -D /dev/md127
sudo grub-probe -t fs -d /dev/md127 -vvv
** Package changed: ubiquity (Ubuntu) => grub2 (Ubuntu)
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1366575
Title:
trusty 14.01 efi installer crashes on grub install failure
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