[Merge] ~dbungert/livecd-rootfs:lp-2078980 into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Review: Approve

This feels a bit gross but it works I guess? I wonder if autopkgtest's contract could be extended to say that $AUTOPKGTEST_TMP does _not_ have things like nodev set but well.
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https://code.launchpad.net/~dbungert/livecd-rootfs/+git/livecd-rootfs/+merge/472605
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