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Ubuntu's package management system

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 typically exist in repositories which are
collections of packages found on various media, such as CD-ROM discs, or online. Packages are
normally of the pre-compiled binary format; thus installation is quick and requires no compiling of
software.
Many complex packages use the concept of 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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