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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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Using X

X.Org (www.x.org) is the X server that is used with Ubuntu. The base distribution consists of many packages including the server, support and development libraries, fonts, various clients, and documentation. An additional 1,000 or more X clients, fonts, and documentation are also available in the Ubuntu repositories.

The /usr directory and its subdirectories contain the majority of the Xorg software (along with a lot of other stuff; the location is not exclusive to X). Some important subdirectories are as follows:

Image /usr/binThis is the location of the X server and various X clients. (Note that not all X clients require active X sessions.) ...

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