If there's one thing that's great about Linux, it's choice. If the user doesn't like a particular program, there's a pretty good chance that Linux has at least one alternative. This even applies to the entire desktop environment. The desktop environment comprises a lot of different programs, such as a window manager (which handles drawing borders around the windows, moving them, and so forth), panels so the user can launch programs, background-management programs, and more. The most popular of these desktop environments are GNOME and KDE. Ubuntu defaults to GNOME as its desktop environment but also offers a Kubuntu alternative that automatically defaults to KDE instead.
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