An operating system (OS) is a set of software that manages computer hardware resources and provides common services for computer programs. The operating system is a vital component of the system software in a computer system. Application programs require an operating system to function.
Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and will frequently make a system call to an OS function or be interrupted by it. Operating systems can be found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers. Examples of popular modern operating systems include Android, BSD, iOS, GNU/Linux, Mac OS X, Microsoft Windows, Windows Phone, and IBM z/OS. All these, except Windows and z/OS, share roots in UNIX.
Operating Systems
Ubuntu 10.04.4 LTS (Lucid Lynx) 32-Bit (retail boxed)
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Ubuntu 10.04.4 LTS (Lucid Lynx) 64-Bit (retail boxed)
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Ubuntu 9.04 (Jaunty Jackalope) 32-Bit edition
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Ubuntu 10.10 (Maverick Meerkat) 64-bit retail boxed
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Ubuntu 10.10 (Maverick Meerkat) 32-bit retail boxed
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Ubuntu 11.04 (Natty Narwhal) 64-bit retail boxed edition
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Ubuntu 11.04 (Natty Narwhal) 32-bit retail boxed edition
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Ubuntu 11.10 (Oneiric Ocelot) 64-Bit Retail Boxed
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Ubuntu 11.10 (Oneiric Ocelot) 32-Bit Retail Boxed
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Ubuntu 12.04 LTS (Precise Pangolin) 64-Bit Retail Boxed Edition
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