[Merge] ~simpoir/livecd-rootfs/+git/livecd-rootfs:lp2037338_var_scoping into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Review: Approve

Thank you for this, this bit of code had been bugging me for a while!
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https://code.launchpad.net/~simpoir/livecd-rootfs/+git/livecd-rootfs/+merge/452040
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