Ubuntu Frame - a new Ubuntu Linux Internet of Things distro - is designed specifically for digital signs and user kiosks, and comes with built-in security through secure client-server communications based on the Wayland protocol and  automatic notifications on security vulnerabilities.

We use Canonical's Ubuntu Linux on desktops, servers, and clouds all the time. But Ubuntu also finds its way into narrower purposes. For example, Ubuntu Core Linux is often used in Internet of Things (IoT) devices. Now, with Ubuntu Frame, Ubuntu has an even more specialized role: digital signs and user kiosks. 

Ubuntu Frame makes it easy to build and deploy graphical applications for interactive kiosks, digital signage, or other products requiring a graphical output. Besides just providing an Ubuntu Linux base, it also comes with integrated Direct Rendering Manager (DRM) and Kernel Mode Setting (KMS) to back up displays. This means you'll have less code to manage and fewer opportunities for bugs and vulnerabilities in untried code. All this, in turn, gives programmers more time to work on the display's content rather than fine-tuning the display itself.