[Merge] livecd-rootfs:lp.1981109 into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

This seems fine, but it would be nicer to fix our seeds somehow... we should have a session with a very large piece of paper at a sprint at some point...
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https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/427387
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