[Merge] ~adrianoco/grub/+git/ubuntu:unapplied/profile into ~ubuntu-core-dev/grub/+git/ubuntu:ubuntu

[Mate Kukri]

Review: Disapprove

What is the purpose of this?

Couldn't this problem be solved with an ubuntu-release-upgrader quirk and/or some documentation?
We should prevent problematic machines from being upgraded, then document that RVA20 is no longer supported.

This is a lot of code for little value. 
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https://code.launchpad.net/~adrianoco/grub/+git/ubuntu/+merge/488194
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