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\marginnote[-2\baselineskip]{Most of the applications in the \menu{System \then Administration} menu will prompt you to enter your user password when you launch them. Some applications will require you to click a button to unlock it. Press this button, and enter your password. After entering your password you gain increased privileges. This is a security feature to make sure that only authorized people are allowed to change system settings. To learn more about security in Ubuntu, see \chaplink{ch:advanced-topics}.} The \menu{Administration} sub-menu contains applications you can use to monitor computer performance, change disk partitions, activate third-party drivers, manage all installed printers, and manage how your computer receives updates from Ubuntu. This sub-menu also has the \application{Synaptic Package Manager} for locating and downloading software packages. This is a more technical alternative to \application{Ubuntu Software Center} and should be used by power users.