[Merge] ~juliank/livecd-rootfs:minimize-manual-earlier into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Review: Approve

Looks sane to me. Have you tested that this gets rid of the files in an ubuntu-base:minimized build? Is there a reason you haven't made a merge proposal for bionic?
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https://code.launchpad.net/~juliank/livecd-rootfs/+git/livecd-rootfs/+merge/366506
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