Well, you may expect issues with some applications if your hardware is not well supported, specially with wifi cards and video cards.
Keep in mind that native iOS development is just available on Apple OSs.
Ubuntu is a nice entry point for newcomers. The community is big and almost any possible problem you may encounter it's already marked SOLVED on a blog post.
My Recommendations: Try it, play with it, break it as much as you can and try to fix it, this is the only way to learn, don't be afraid, the installation only takes 10 mins.