Lubuntu 13.04 is a desktop Linux distribution with the lightweight but full-featured LXDE desktop environment: "Lubuntu 13.04 is now available. Features: based on the lightweight LXDE desktop environment; PCManFM, a fast and lightweight file manager using GIO/GVFS; Openbox, the fast and extensible LXDE window manager of LXDE; LightDM; Chromium, the open-source version of Google Chrome; based on Ubuntu 13.04. Improvements since Lubuntu 12.10: new version of PCManFM (1.1.0) including a built-in search utility; artwork improvements, including new wallpapers, community wallpapers, new icons; removed Catfish, since PCManFM has its own search utility; fixed a very old bug causing GNOME MPlayer to crash with some CPUs; several fixes for the GPicView image viewer.
About Lubuntu
Lubuntu is a fast, lightweight and energy-saving variant of Ubuntu using the LXDE (Lightweight X11 Desktop Environment) desktop. It is intended to have low-resource system requirements and is designed primarily for netbooks, mobile devices and older PCs.