They are releasing steady updates for it. 4.1 came out Nov 2012. That's hardly 2 years. That's after the last Ubuntu release. And it's fully supported for the platform. What are you talking about?
Well that's news to me. The last I looked was before November, I guess, and before that it still had the same old crufty UI from like 5 years ago. The userbase had been pretty up-in-arms about it for a while too: http://community.skype.com/t5/Linux/Vote-here-for-linux-skyp...
Edit: also, they're still sitting on version 5, which introduced group video calling. It's a pretty sad situation overall.
