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. Lubuntu is intended to be a low-system-requirement, low-RAM environment for netbooks, mobile devices, and older PCs. Tests show it can use half as much RAM as Xubuntu, making it an attractive choice for installing on older hardware such as being refurbished for charitable distribution.
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