Quick, name an operating system company that’s struggling to push beyond PCs into the smartphone and tablet markets? The obvious answer is Microsoft (MSFT) with Windows 8. But in the Linux and open source world, Canonical’s Ubuntu also applies. And if you look at the Ubuntu Edge smartphone crowdfunding effort, you may see that Canonical needs far more cash for its mobile push. My spin: It’s time for Ubuntu Founder Mark Shuttleworth to seek a buyer for his company.