Xubuntu is Ubuntu with Xfce desktop environment. Xfce is something like Unix operating system. Design for lightweight PC which mean old PC but optimize to be fast and user friendly. Its only need minimum of 192 Mbytes of memory and 2 Gbytes of free space hard disk for installation. Installation process also very easy and fast. Soon we will have Sabily with Xfce environment which is now under study by Sabily group member on Facebook. He will call it XSabily. For your reference, I share my experience installing Xubuntu 10.10 Maverick Meerkat.
01. Boot from Live CD. Language menu appeared.
We can find many distro that include Xfce desktop environment in their release for example Ubuntu, Debian, Mandriva, Open Suse, Solaris etc. I'm enjoyed installed it on my Virtualbox. Hope you have fun to install it on your system or your virtual machine.