Human beings are creatures of habit, it seems safe to say, and tend to have a hard time embracing change. So it has been no great surprise to see the widespread shock and dismay — mixed, still, with considerable excitement — over the decision to make Unity the next desktop Ubuntu’s default interface. Yes, for those who missed it, Natty Narwhal — or Ubuntu 11.04 — will not use the distribution’s longtime GNOME Shell as the default desktop interface. Rather, it will feature the 3D and multitouch-enabled Unity, which just appeared in the netbook edition of Maverick Meerkat.