Xubuntu is a complete GNU/Linux based operating system with an Ubuntu base. It is lighter on system requirements and tends to be more efficient than Ubuntu with GNOME or KDE, since it uses the Xfce Desktop environment, which makes it ideal for old or low-end machines, thin-client networks, or for those who would like to get more performance out of their hardware.
Kubuntu is a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month release cycle and part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.
XPDF is a suite of tools for Portable Document Format (PDF) files. These are sometimes referred to as ‘Acrobat’ files after the name of Adobe’s PDF software. To enable support for Foreign Languages including Chinese to view PDF Files you need to install the language support. Here are the instructions.
Preload is an adaptive read-ahead daemon. It monitors applications that users run, and by analyzing this data, predicts what applications users might run, and fetches those binaries and their dependencies into memory for faster startup times.
Ubuntu Studio is a multimedia editing/creation flavour of Ubuntu. It’s built for the GNU/Linux audio, video, and graphic enthusiast or professional.Ubuntu Studio is an unofficial derivative of the Ubuntu open source operating system, based on Ubuntu, which is explicitly geared to general multimedia production.
Enlightenment has something to do with the light. It is a window manager that comes with special effects.Development Release 17 of the Enlightenment window manager represents an evolution into the next generation of desktop environments: