Ubuntu Pro is a subscription offering for Ubuntu users who want to pay for the assurance of getting quick and high-quality security updates for Ubuntu. I tested it out to see how it works in practice, and to evaluate how well it works as a commercial open source service model for Linux.\n
Pro involves Canonical making unilateral updates to certain packages, while the main universe relies on the package’s maintainers to make updates available. Unless you were to want Canonical to take over development of every bit of linux software, I don’t see how they could improve this.