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One of the key features offered by any package management system is dependency management. Put simply, the package manager ensures that if you install a piece of software, any additional software it relies on to work properly is already present on the system. It the software isn t present, the package manager must either resolve the situation automatically or ask you what to do. Sometimes the software you want to install might depend on other programs on your system, such as applications that simply add a graphical front end to shell applications, but more often, the dependencies take the form of system libraries. It helps if you realize that not all packages contain software that you, as a user, will make direct use of. Some packages contain nothing but library files shared pieces of code that are equivalent to .dll files under Windows. The key library on an Ubuntu system is the GNU C Library, without which the Linux kernel couldn t function, which is provided by the libc6 package. But practically every program has its own needs when it comes to library files, and these requirements must be handled by the package manager.
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Note One reason Windows installation files are often so large is that they typically come with all the system files they need, in case they re not already present on the system. This does not make dependency problems disappear, however. Third-party application installers sometimes overwrite existing libraries with versions that are incompatible with the rest of the system.
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CHAPTER 20 INSTALLING AND REMOVING SOFTWARE
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Dependency management doesn t just mean adding in packages that a piece of software needs. It might also mean removing packages already present on your system. This might need to happen if they re incompatible with new software you want to install, something that s referred to as package conflict. In addition, sometimes you might want to remove a package that other packages rely on, a situation known as reverse dependency. In such a case, the package manager must either stop you from removing that software, to avoid breaking the software that depends on it, or remove the reversedependency packages too. In most cases, the package manager ask you what to do.
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DEPENDENCY HELL
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If you try to install certain software packages, you will very likely find that they depend on other packages, such as software libraries. These must be either already present on the system or installed at the same time for the software to work correctly. In most cases, the Synaptic Package Manager takes care of all this. Dependency hell, which is far less common than it once was, comes about when chains of dependencies arise, which is to say, when a program you install or remove involves the installation or removal of several other, apparently unrelated pieces of software. For example, let s say you decide to manually install a program called Oscar. You download it and type the command to install it, but you are then told that this depends on another program called BigBird, which isn t installed. Fine, you think, I ll just download and add BigBird to the same installation command. But it then transpires that BigBird has its own dependency of Snuffleupagus. You download and add that too. Alas! Snuffleupagus has its own dependency of MrHooper. This can carry on for some time, and this is why you should use the Ubuntu Software Center to install and remove software and try to stay within the standard Ubuntu repositories (see the following section). In the preceding example, the Ubuntu Software Center would add in all the dependencies automatically and download and install them at the same time. Dependency chains like this are a by-product of any package management system. The solution is often simple just don t remove the software package. After all, hard disks are extremely large nowadays, and space is rarely an issue, so there s little reason to not have software packages you no longer need hanging around.
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