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1552.

to remove the unnecessary packages.

1555.

If you find yourself in need of a proprietary format, you may install the files necessary for using this format with one command. Before initiating this command, ensure that you have Universe and Restricted repositories enabled. See the \seclink{sec:synaptic} section to learn how to do this.

1556.

Open the \application{Ubuntu Software Center} by selecting it from \menu{Applications}. Search for \textbf{ubuntu-restricted-extras} by typing ``ubuntu restricted extras'' in the search box on the right-hand side of the Ubuntu Software Center's main window. When the Software Center finds the appropriate software, click the arrow next to its title. Click \button{Install}, then wait while Ubuntu installs the appropriate software.

1557.

Once Ubuntu has successfully installed software, your rich media content should work properly.

1561.

You can experiment with various resolutions by clicking \button{Apply} at the bottom of the window until you find one that's comfortable for you. Typically the highest resolution will be the native resolution. Selecting a resolution and clicking \textbf{Apply} will temporarily change the screen resolution to the selected value. A dialog box will also be displayed. It allows you to revert to the previous resolution setting or keep the new resolution. The dialog box will disappear in 30 seconds, restoring the old resolution. \screenshot{08-display-properties-confirm.png}{ss:08-display-properties-confirm}{You can revert back to your old settings if you need to.} This feature was implemented to prevent someone from being locked out of the computer by a resolution that distorts the monitor and makes it unusable. When you have finished setting the screen resolution, click \textbf{Close}.

1588.

\textbf{Ubuntu Server Edition}, which is designed for use on servers, and typically is not used as a desktop operating system because it doesn't have a graphical interface.