The upgrade failed because it can not find the raid array you previously
had grub installed to. Can you post the output of lsblk?
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1641291
Title:
package grub-pc 2.02~beta2-36ubuntu3.2 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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