WP:
Despite a modest launch and a limited distribution in terms of markets, Nokia's N9 model has reached sales estimated between 1.5 and 2 million devices. According to Nokia's own quarterly report and analyst company Canalys analyses, the combined deliveries of the comparable Lumia devices summed to approximately 1.2-1.5 million in the last quarter.
The N9 is the next in the series after the N900, and aside from a lot of very cute UI changes, and a lack of a keyboard (which was relegated to the N950), it still runs on Maemo (though branded MeeGo) and is a Linux phone.
Oh, and they switched to rpms from debs, I think. I can see how that would make you think they were unrelated:)