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CHAPTER 20 INSTALLING AND REMOVING SOFTWARE
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Using the Ubuntu Software Center
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Ubuntu has traditionally had many different tools for application installation and management: the Synaptic Package Manager, Add/Remove Programs, the Update Manager, Software Sources not to mention the command-line tools dpkg and apt. Those were related tools for doing similar tasks around software management. Before undertaking any installation task, you first needed to know which tool to use. And many developers weren t even coordinated to the extent of making their applications available from a single source. So an effort was to be made in two directions: the making of a single, allencompassing tool, and the publication of all available software in that tool. Thus the Ubuntu Software Center was born.
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Navigating the Ubuntu Software Center
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The Ubuntu Software Center is available as the last item in the Applications menu. When opened, it shows a default start page, as shown in Figure 20-1. It is the root of the Get Software item.
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Figure 20-1. The structure of the Ubuntu Software Center
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CHAPTER 20 INSTALLING AND REMOVING SOFTWARE
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The menu bar is a quite straightforward way of performing actions within the Center, but its options are usually disabled. They are made available only at certain times, depending on the section of the Center in which you are. File: Here you will find the Install and Remove commands, only available when you select a specific application in a list, or when you open the application page itself. Only one of the options will be available at a given time, depending on the current state of the application. The Close option is always available and instructs the Ubuntu Software Center to quit (notice that if there are pending operations in progress, the Center will wait until those are completed to close). Edit: Many of the options in this menu, like Cut, Copy, Paste, and Delete, are available only when you are entering text in the Search dialog box. The Copy Web Link option is enabled when you select an application from a list or when you open that application s details page and copy the URL of the application to the clipboard, so you can paste it into your browser and access it directly. The Search option is available whenever the Search dialog box is present, and basically focuses on it. And last, the Software Sources option allows you to modify or add locations from which you want to download applications. More about this later in this chapter. View: Here you can select the scope of the applications which you want to see listed. All Software displays software from all sources. Canonical-Maintained Software displays only software maintained by the company behind Ubuntu. Help: Here you can access useful help information about the Ubuntu Software Center. The navigation pane is used to browse the different sections of the Ubuntu Software Center. It has three main elements, of which one is usually hidden. The main page changes depending on the element selected in the navigation pane. Get Software: This is used mainly to locate and install software in the catalog. This catalog is constructed by using software sources, of which you can see the default two: Provided by Canonical, and Canonical Partners. More items appear under Get Software as you begin to add alternative software sources, as explained later in this chapter. Those two default sources are by far the most secure way of installing applications in Ubuntu much safer than downloading them from an unknown web site. But someday you may want to install software not officially endorsed by Canonical, and for that it is important to know how to add software sources. Installed Software: Here you see the list of software already present in your computer, and can remove it. Installed software is recognizable by the checkmark that accompanies its icon in the list. Browse this section if you don t want to install additional software; you could for instance just see what you have installed, or remove an application that is no longer needed (to free up disk space, for instance). In Progress: When performing actions like installing or removing applications, or updating the software catalog, you will notice in the notifications pane a third element named In Progress. When you select this item, you can see in the main pane the status of each of those actions, along with a progress bar indicating how near to completion the task is. If you are installing an application, for instance, a Cancel button will show up next to the progress bar while downloading the application. Once the installation starts (after download), it cannot be canceled. When all actions have completed, the In Progress element returns to its hidden state. The status bar usually shows useful information about the number of applications in each section. For example, when selecting Get Software for the first time, it shows the total number of applications in the catalog (32,420 at the time of writing!). If you select a particular department, it shows the number of applications in that department (for instance, the Office department shows 124 applications). When using the Search dialog box, it tells the number of applications that matched the search terms.
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