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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, 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 applications installers sometimes overwrite existing libraries with versions that are incompatible with the rest of the system.
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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 upon, a situation known as reverse dependency. In such a case, the package manager must either stop you from removing that software,
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to avoid breaking the software that depends on it, or remove the reverse-dependency packages, too. In most cases, it will ask you what you wish to do.
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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. Ubuntu will attempt to take care of the latter automatically. In a similar way, removing software also means that other packages that rely on that particular software must also be removed, a situation known as reverse dependency. Dependency hell 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 it s not advised to manually install or remove software without using something like Synaptic Package Manager. In the preceding example, Synaptic 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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