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\marginnote{To read more about other variants of Ubuntu, refer to \chaplink{ch:learning-more}.} In Linux distributions (such as Ubuntu), a number of desktop environments are available. Ubuntu uses \application{Unity} as the default desktop environment. After installing and logging into Ubuntu, you will see the Unity desktop. The Unity desktop is comprised of the desktop background and two bars\dash a horizontal one located at the top of your desktop called the \emph{menu bar} and a vertically-oriented bar at the far left called the \emph{Launcher}.