I noticed that there is an error in your logs about a leftover gpt
partition table still being on the disk. Can you run sudo grub-probe -t
drive -d /dev/sda1, and post the results?
** Changed in: grub-installer (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1311725
Title:
Installation crashed after grub setup on md array
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