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24.

It is possible to increase the number of programs that can be installed with package managers. The default installation does not include all the programs that can be used with <phrase>Kubuntu</phrase>. System functionality can be enhanced by including more applications and newer software. This document describes how to add software repositories.

25.

The software that comprises <phrase>Kubuntu</phrase> is being improved continuously. With an Internet connection and <phrase>Kubuntu</phrase> software updating, the latest improvements and security fixes can be applied to a system easily. This document explains how to perform update.

30.

The application will show up in the large white space below the search area. Click on the down arrow symbol next to the software to be installed. The arrow will change color. Click <guilabel>Apply</guilabel> to start the installation process.

31.

KpackageKit might provide information about required dependencies. Acknowledge this information, and the required packages will begin downloading. When the installation process is complete, the software will be ready to use. It is rarely necessary to restart the system after software installation or update.

35.

<application><acronym>APT</acronym></application> (Advanced Packaging Tool) is a powerful package management system, which is the basis for the graphical <application>Software Management</application> application. <application>APT</application> automatically handles dependencies and performs other package operations that are required for package installation.

36.

Running <application>APT</application> requires administrative privileges. Entering commands with "sudo" generates a password prompt. Several of the commands below will not run without sudo.

43.

Install the latest available updates for the applications currently installed: <screen>sudo apt-get upgrade</screen>

46.

<application>Aptitude</application> is a command line front-end to <application>APT</application>. <application>Aptitude</application> allows for interactive package selection to remove, update or install packages. <application>Aptitude</application> is an advanced package management system, with more control and capability than <application>APT</application> as a command line tool.

48.

Although the preferred method of installing programs is with the package manager described in <xref linkend="kpackagekit"/>, individual software package files can be downloaded and installed. Several kinds of package files are available for Linux systems. Generally, these file types are associated with the package managers of specific Linux distributions.

49.

To install a particular application, it is preferable to select a <phrase>Kubuntu</phrase> package of the application, and install it with a package manager. This ensures that the program is compatible with other software on the system. If there is no version of the package available through a package manager, it may be possible to install it manually. The installation procedure depends on the type of package file.