Install CD's of various versions of the Ubuntu system. Ubuntu is Linux distribution - free operating system. It is simple in use and very intuitive. It might be used even by the beginners. Due to an easy access to many free programs, it is the system, which will fulfill the expectations of many users, especially those who use the Internet. The Ubuntu users, as well as the users of other Linux systems, highly value its stability, safety and variety of software, as well as a large capability of adjusting the system to personal needs. The system might be downloaded for free from the Internet or even order free install CD's. It may be installed parallel to other operating systems, although usually it is not necessary.