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

[Gunnar Hjalmarsson]

Review: Approve

This looks good to me now. Didn't know that the rpartition() method existed, but it fits well in this context. And it did The Right Thing for me when testing.

Thanks for your work, and especially the idea to postpone the font resetting until after the reboot!
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https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/452304
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