Kodibuntu is a combination Kodi/operating system for use on PCs that are mainly just running Kodi. It is an alternative to installing Windows or a larger (and sometimes more complicated) Linux-based OS.
Install instructions are here: http://kodi.wiki/view/Kodibuntu
Pro Updates can be run remotely
Using a Linux distro (not only Ubuntu) with Kodi allows you to run system and software updates remotely through SSH. Not only that, it's also very easy to update the system because only a couple of commands are needed.
Pro Open source
Both Kodi and Ubuntu are free and open source.
Con Sub-par graphic drivers support
Support for graphic drivers is not the best. For example, if you want to do any gaming on Kodibuntu you need an Nvidia card and install the proprietary drivers. Though for Kodi alone the Open Source drivers are good enough.