[Merge] ~enr0n/ubuntu-release-upgrader:deadcode into ubuntu-release-upgrader:ubuntu/main

[Julian Andres Klode]

Review: Approve

Ship it! I just hope we are never going to need PreRequists again :D
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https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/468104
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