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Linux|(

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Ubuntu is built on the foundation of Linux, which is a member of the \Index{Unix} family. \Index{Unix} is one of the oldest types of operating systems and has provided reliability and security in professional applications for almost half a century. Many servers around the world that store data for popular websites (such as YouTube and Google) run some variant of a \Index{Unix} system. The Linux \Index{kernel} is best described as the core, or almost the brain, of the operating system.

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The Linux \Index{kernel} is the controller of the operating system; it is responsible for allocating memory and processor time. It can also be thought of as the program which manages any and all applications on the computer itself.

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\marginnote{While modern graphical \glspl{desktop environment} have generally replaced early command-line interfaces, the command line can still be a quick and efficient way of performing many tasks. See \chaplink{ch:advanced-topics} for more information, and \chaplink{ch:the-ubuntu-desktop} to learn more about \gls{GNOME} and other desktop environments.} Linux was designed from the ground up with security and hardware compatibility in mind, and is currently one of the most popular \Index{Unix}-based operating systems. One of the benefits of Linux is that it is incredibly flexible and can be configured to run on almost any device\dash from the smallest micro-computers and cellphones to larger super-computers. \Index{Unix} was entirely command line-based until graphical user interfaces (\glspl{GUI}) began to emerge in the early 1990s.

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\marginnote{A \emph{desktop environment} is a sophisticated and integrated user interface that provides the basis for humans to interact with a computer using a monitor, keyboard and a mouse.} These early \acronym{GUI}s were difficult to configure, clunky, and generally only used by seasoned computer programmers. In the past decade, however, graphical user interfaces have come a long way in terms of usability, reliability, and appearance. Ubuntu is just one of many different Linux \emph{distributions}, \marginnote{To learn more about Linux distributions, see \chaplink{ch:learning-more}.} and uses one of the more popular graphical desktop environments called \acronym{GNOME}.

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Linux|)

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New users to Ubuntu may find that it takes some time to feel comfortable when trying a new operating system. You will no doubt notice many similarities to both Microsoft Windows and Mac \acronym{OS~X}, and some differences. Users coming from Mac \acronym{OS~X} are more likely to notice similarities due to the fact that both Mac \acronym{OS~X} and Ubuntu originated from \Index{Unix}.

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Before you decide whether or not Ubuntu is right for you, we suggest giving yourself some time to grow accustomed to the way things are done in Ubuntu. You should expect to find that some things are different from what you are used to. We also suggest taking the following into account:

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Ubuntu is community based.

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That is, Ubuntu is developed, written, and maintained by the community. Because of this, support is probably not available at your local computer store. Fortunately, the Ubuntu community is here to help. There are many articles, guides, and manuals available, as well as users on various Internet forums and Internet Relay Chat (\acronym{IRC}) rooms that are willing to assist beginners. Additionally, near the end of this guide, we include a troubleshooting chapter: \chaplink{ch:troubleshooting}.