[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:ua-tools-prefs-save into livecd-rootfs:ubuntu/trusty

[Philip Roche]

Review: Approve

+1 I confirm that the resulting tarball from @mwhudson's tests are as expected.

Also +1 on landing this in other branches as the issue will most likely hit us when Xenial transitions to ESM. 
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/376441
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