FunOS is a lightweight operating system built on Ubuntu LTS, focusing on stability, performance, and security. It uses Joe's Window Manager, consumes approximately 250 MB of RAM when idle, and has a compact installer size of 1.8 GB. The installation process is straightforward, taking under five minutes, and features a familiar desktop layout. FunOS lacks a graphical user interface for the package manager, requiring users to utilize the command line for software management, although Synaptic can be installed for easier application installations. New applications require a menu reload to appear. FunOS is suitable for aging Windows 10 machines, providing a reliable and efficient computing experience.