Kubuntu is a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month release cycle part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.
Pros: Kubuntu is a powerful and free operating system. The default installation process is incredibly user-friendly and includes almost every application that you would ever need to get started in the world of Linux. Kubuntu is fully supported by both its developers and an enthusiastic user community. Kubuntu is a cross-platform operating system for PowerPC Macs, Intel x86 PCs, and AMD64 PCs.
Cons: Kubuntu does not support AirPort Extreme cards at this time. The blame for this lies entirely with Broadcom, as they have refused to provide native Linux drivers and specifications for the chipset that powers the AirPort Extreme cards.