text: Ubuntu's Software Center lets you install just about anything, including free software, purchased apps, and games.
  Ubuntu includes the convenient Software Center, which provides centralized software management and lets you search for new software and install it with a mouse click. With an Ubuntu One account, you can purchase software simply with a credit card.
  The Debian packages (ending in .deb) that Software Center offers are actually 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 dependencies exist, which means that installing program A requires that you have program B installed also. The package manager identifies the dependent packages automatically during installation and loads them onto the computer. Usually, you will notice the dependencies when you try to install a single Debian package over the Internet.
  The package you are looking for, such as a video codec, may be missing in the Software Center. In this case, you can find the package in external repositories created by the software's users or developers. The repositories contain not only the software, but also the packages on which they depend. (How to tap into these repositories is covered in the "What Are Repositories?" section.)
  Package Manager in Action
  Getting to repositories and installing software is often faster from the command line. The "Quick Sources" section goes into greater detail. To begin, I'll look at managing packages using Ubuntu's Software Center.
  To access the Software Center, press the Super key [1] and enter softw. The start page (Figure 1) features a few What's New and Top Rated applications. Clicking More on the far right gives you additional choices.
  Figure 1: Software Center encourages you to browse.
  If you click Turn On Recommendations at the bottom, Ubuntu suggests opening a user account at Ubuntu One. Then, your computer regularly sends lists of software you've installed to Canonical and the company returns a list of recommended software that might interest you. These recommendations appear on the start page and can be deactivated with View | Turn Off Recommendations in the global menu. In the meantime, you can purchase programs using your Ubuntu One account.
  Use the arrow icons in the upper left to return to the start window. Starting with the release of Ubuntu 12.10, Ubuntu developers have placed ads for free and commercial software from the Software Center across the broad surface of the screen under the heading Our Favorites.
  The left side of the Software Center screen organizes the applications by category. Clicking a category opens subcategories (Figure 2). All other controls are at the top of the package management window. The All Software menu lists all the software in all the available repositories. If you click the little white triangle next to the menu item (Figure 3), you'll find the entries Provided by Ubuntu (mostly free software), Canonical Partners (free and commercial software without source code, e.g., Skype and Flash), and For Purchase (commercial software, including many games).
  Figure 2: Clicking a category opens up subcategories.
  Figure 3: Clicking the little white arrow next to "All Software" shows the integrated repositories.
  Clicking Installed on the menu bar at the top displays only the installed applications, sorted by category. Click the little triangle to the right to view the packages from a single source. At the far right is the History menu item that tells you which software you downloaded. Check here if an upgrade suddenly isn't working. Downgrading, unfortunately, doesn't work in Software Center. To do that, you must install the Synaptic Package Manager and specify an earlier Version in Properties.
  If you already know the name of the software, you can search for it in the search field at the upper right. Results come from the repository that you use for All Applications. Next to the software names are the ratings in the form of stars. Once you select a package, the More Info and Install buttons appear.
  The first button leads to a detailed description of the program, often showing a screenshot (Figure 4). Look under the Add-ons section to see software that could enhance the program. Here People also installed displays other programs to consider. You can also filter reviews by language is. Finally, click the Install button to install the program. Once installed, you can click the Write your own review link to evaluate the software. This action requires a Launchpad account [1].
  Figure 4: Once you choose an installable package, you'll receive further information: ratings, screenshots, descriptive text, and more.
  The Software Center global menu includes other interesting options. In the File menu, you can choose Reinstall Previous Purchases or Sync Between Computers to move your package selections to other computers over the Ubuntu One cloud service. Also, you can use Edit | Software Sources to add other repositories. If you don't want to display new applications automatically in the Launcher, unmark the New Applications in Launcher check box in the View menu.
  What Are Repositories?
  Software Center gives you access to thousands of packages, but the one you want might be missing or available only in an older version. In this case, external repositories and the PPAs can help.
  The Opera repository [3] is one of the external repositories, and it provides the Opera web browser that is missing from Ubuntu's standard repositories. The VirtualBox project [4] provides the proprietary version of its own software, which supports the virtual USB 2.0 ports and Remote Desktop Protocol (RDP), from its own repository.
  Personal Package Archives (PPAs) are special versions of external repositories that you can find only on Ubuntu's Launchpad. When experienced Ubuntu users or developers create Debian packages out of their favorite software, they frequently offer them in their personal package archive on Launchpad. Using a search function [5], you can peruse the platform for new versions of current software with great success.
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