[Merge] ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:ubuntu-desktop-simplified into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:mantic

[Michael Hudson-Doyle]

Review: Approve

Implementation wise this looks fine. Conceptually... well that's not my call :-)
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https://code.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu/+merge/446212
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