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As a server administrator, you'll often need to make a choice between security 
and feature updates. Security updates are the most important of all and allow you 
to patch your servers in response to security vulnerabilities. Sometimes, feature 
updates become required in your organization because it's decided that new features 
may benefit you or may become required for current objectives. In this chapter, 
we won't focus on installing security updates (we'll take care of that in 
Chapter 21
, 
Securing Your Server
), but it's important to understand the reasons new packages are 
made available to you.
Package management is typically very convenient in Ubuntu, with security updates 
and bug fixes coming regularly. With just one command (which we'll get to shortly), 
you can install a package along with all of its dependencies. Having performed 
manual dependency resolution myself, I can tell you first-hand that having 
dependencies handled automatically is a wonderful thing. The main benefit of how 
packages are maintained on a Linux server is that you generally don't have to search 
the internet for packages to download, as Ubuntu's repositories contain most of the 
ones you'll ever need. As we continue through this chapter, you'll come to know 
everything you need in order to manage this software.