[Merge] ~enr0n/ubuntu-release-upgrader:lp.1991096 into ubuntu-release-upgrader:ubuntu/main

[Nick Rosbrook]

Review: Needs Fixing

It seems I will need to make at least one more change in this upload.
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https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/430690
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