Software management in Ubuntu 13.04
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Ubuntu includes the convenient Software Center, which provides centralized software management and allows you to search for new software and install it with a mouse click. With an Ubuntu One account, you can purchase software with a credit card.
The Debian packages (ending in .deb) that the Software Center offers are archive files containing libraries, configuration files, and executable programs. If you install the Firefox package, for example, the package manager distributes the necessary files to the correct places in the filesystem.
Often a program has dependencies, which means that installing program A requires that you also install program B. The package manager identifies the dependent packages automatically during installation and loads them on the computer. Usually you will notice the dependencies when you try to install a single Debian package over the Internet.
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