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

[Nick Rosbrook]

> This looks great to me, my only suggestion would be putting 'Sans' in a
> variable in case we change our minds some day.

Ack, will do before I merge. Thanks!
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https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/452304
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