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123.

The Live \acronym{CD}

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The Ubuntu \acronym{CD} functions not only as an installation \acronym{CD} for putting Ubuntu onto your computer, but also as a Live \acronym{CD}. A Live \acronym{CD} allows you to test Ubuntu without making any permanent changes to your computer by running the entire operating system straight from the \acronym{CD}.

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Your computer reads information from a \acronym{CD} at a much slower speed than it can read information off of a hard drive. Running Ubuntu from the Live \acronym{CD} also occupies a large portion of your computer's memory, which would usually be available for programs to access when Ubuntu is running from your hard drive. The Live \acronym{CD} experience will therefore feel slightly slower than it does when Ubuntu is actually installed on your computer. However, running Ubuntu from the \acronym{CD} is a great way to test things out and allows you to try the default applications, browse the Internet, and get a general feel for the operating system. It's also useful for checking that your computer hardware works properly in Ubuntu and that there are no major compatibility issues.

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\marginnote{In some cases, your computer will not recognize that the Ubuntu \acronym{CD} is present as it starts up, and will start your existing operating system instead. Generally, it means that the priority given to \emph{devices} when your computer is starting needs to be changed. For example, your computer might be set to look for information from your hard drive first, and then to look for information on a \acronym{CD} second. In order to run Ubuntu from the Live \acronym{CD}, we want it to look for information from a \acronym{CD} first. Changing your \emph{boot priority} is beyond the scope of this guide. If you need assistance to change the boot priority, see your computer manufacturer's documentation for more information.} To try out Ubuntu using the Live \acronym{CD}, insert the Ubuntu \acronym{CD} into your \acronym{CD} drive and restart your computer. Most computers are able to detect when a bootable \acronym{CD} is present in your drive at startup\dash that is, a \acronym{CD} that will temporarily take precedence over your usual operating system. As your computer starts, it will run whatever information is stored on this bootable \acronym{CD}, rather than the information stored on your hard drive which your computer usually looks for.

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Once your computer finds the Live \acronym{CD}, and after a quick loading screen, you will be presented with the ``Welcome'' screen. Using your mouse, select your language from the list on the left, then click the button labeled \button{Try Ubuntu 10.04}. Ubuntu will then start up, running straight from the Live \acronym{CD}.

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\screenshot{01-live-cd-welcome.png}{ss:live-cd-welcome}{The ``Welcome'' screen allows you to choose your language.}

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Once Ubuntu is up and running, you will see the default desktop. We will talk more about how to actually use Ubuntu in \chaplink{ch:the-ubuntu-desktop}, but for now, feel free to test things out. Open some programs, change settings and generally explore\dash any changes you make will not be saved once you exit, so you don't need to worry about accidentally breaking anything.

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When you are finished exploring, restart your computer by clicking the ``Power'' button in the top right corner of your screen (circle with a line through the top) and then select \menu{Restart.} Follow the prompts that appear on screen, including removing the Live \acronym{CD} and pressing \keystroke{Enter} when instructed, and then your computer will restart. As long as the Live \acronym{CD} is no longer in the drive, your computer will return to its original state as though nothing ever happened!

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Minimum system requirements

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system requirements|(