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For information on how to download Ubuntu from the Internet, see the download web page (http://www.ubuntu.com/download/). The list of Ubuntu mirrors (http://wiki.ubuntu.com/Archive) contains a full set of official Ubuntu mirrors, so you can easily find the nearest one.
Ubuntu can be upgraded after installation very easily. The installation procedure will help set up the system so that you can make those upgrades once installation is complete, if need be.