Make Tech Easier published a tutorial about converting Ubuntu Into Regolith Linux.

How to Convert Ubuntu Into Regolith Linux

Regolith Linux isn’t your typical Linux distribution. It falls somewhere in between being a distribution and a desktop environment, as it is built on top of Ubuntu. And unlike most typical Linux distributions, Regolith doesn’t have to be installed as a standalone operating system. If you are already using Ubuntu as your operating system, then you can install Regolith on top of it for a preconfigured i3 experience.

How to Convert Ubuntu Into Regolith Linux