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Sometimes, you may want to add more than one display device to your desktop, or may want to add an external monitor to your laptop. Doing this is quite simple. Whether it's an extra monitor, \acronym{LCD} \acronym{TV}, or a projector, Ubuntu can handle it all. Ubuntu supports the addition of multiple displays by default, which is as easy as plug and play. Ubuntu recognizes almost all the latest monitors, \acronym{TV}s and projectors by default. Sometimes it may happen that your additional display is not detected when you connect it to the machine. To resolve this, go to \menu{System Settings \then Displays} and click on \menu{Detect Displays}. This will detect the monitors connected to the machine. This menu can also be found from the \menu{Power Off} menu on the top panel. You can also search for Displays at the Dash search bar. Now, there are two modes which you can enable for your displays. One option is to spread your desktop across two or more monitors. This is particularly useful if you are working on multiple projects and need to keep an eye on each of them at the same time. The second option is to mirror the desktop onto each of the displays. This is particularly useful when you are using a laptop to display something on a larger screen or a projector. To enable this option just check the box beside \checkbox{Mirror displays} and click \button{Apply} to save the settings. You will get a pop-up notification asking if you want to keep the current setting or revert to the previous setting. Click to keep the current setting. Starting from Ubuntu 12.04, you can also select whether you want the Unity Launcher in both the displays or only in the primary display.
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