[Merge] ~xnox/grub:fix-postinst into ~ubuntu-core-dev/grub/+git/ubuntu:focal-security

[Dimitri John Ledkov]

Wrong branch target.

Better target & better commit message at https://code.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/+merge/388432
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https://code.launchpad.net/~xnox/grub/+git/grub/+merge/388383
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xnox/grub:fix-postinst into ~ubuntu-core-dev/grub/+git/ubuntu:focal-security.