Let's just make sure to begin with that the partition is indeed what we expect:
/dev/mapper/ddf1_4c53492020202020808627c3000000004711471100001450p1
^ This should be the partition used for /boot.
Could you also please re-run grub-install with the '-v' switch so we
have additional information about how it attempts to setup the
bootloader?
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
** Changed in: grub2 (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1428793
Title:
package grub-pc 2.02~beta2-9ubuntu1 failed t install/upgrade:
subprocess script post-installation installed returned error output
status 1
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