Ubuntu removed itself from the game when they stopped supporting ARM6. So there wasn't much R-Pi could do about it.
Princess Elizabeth was never the Heir Apparent as there was always possiblilty of a son taking her place, so she was only Heir Presumptive.
When I first read about this as a small kid of about 5, I couldn't sleep for a week, it really upset me. From that day on whenever I read that science book I would always quickly skip past that page. I guess 5 billion years just didn't seem that long to me back then.
You don't have to be a British Citizen to vote in the British Election, any commonwealth country or Irish citizenship will do.