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Ubuntu turns 20: 'Oracular Oriole' shows this old bird's still got plenty of flight
(www.theregister.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
It's a free security upgrade that the os gives you the option to use. There is an enteprise version that includes technical support, but that is an extra addon.
There is no fee for personal use.