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1. Introduction‌


Ubuntu's package management system is derived from the same system used by the Debian GNU/Linux distribution. The package files contain all of the necessary files, meta-data, and instructions to implement a particular functionality or software application on your Ubuntu computer.


Debian package files typically have the extension '.deb', and usually exist in repositories which are collections of packages found on various media, such as CD-ROM discs, or online. Packages are normally in a pre- compiled binary format; thus installation is quick, and requires no compiling of software.


Many complex packages use dependencies. Dependencies are additional packages required by the principal package in order to function properly. For example, the speech synthesis package festival depends upon the package libasound2, which is a package supplying the ALSA sound library needed for audio playback. In order for festival to function, it and all of its dependencies must be installed. The software management tools in Ubuntu will do this automatically.


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