Ubuntu is a complete Linux-based operating system, freely available with both community and professional support.
Ubuntu is suitable for both desktop and server use. The current Ubuntu release supports PC (Intel x86), 64-bit PC (AMD64), UltraSPARC T1 (Sun Fire T1000 and T2000) and PowerPC (Apple iBook and Powerbook, G4 and G5) architectures. Ubuntu includes more than 16,000 pieces of software, but the core desktop installation fits on a single CD. Ubuntu covers every standard desktop application from word processing and spreadsheet applications to web server software and programming tools.