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If you plan on running the Ubuntu Server distribution as a virtual machine, you need to ensure that the host machine's operating system is supported by the hypervisor.

For this book, we're focusing on the Oracle VirtualBox hypervisor software. Here are a few of the operating systems on which it can run:

 Windows 8.1

 Windows 10

 macOS High Sierra

 Ubuntu 18.04LTS

This list is always evolving. It's a good idea to visit the Oracle VirtualBox manual website, virtualbox.org/manual, and view the currently supported host operating systems.

Running a virtualized environment will increased the needed resources on your system. You need to make sure that the host machine can handle not only the hypervisor but the Ubuntu Server VM as well. Table 2.2 lists the recommended host machine resources for a virtualized Ubuntu Server system.

TABLE 2.2: Recommended Host Machine Resources for an Ubuntu Server VM

RESOURCE	MINIMUM	RECOMMENDED
CPU	2 GHz dual core	2 GHz dual core
Memory	4 GB	16 or more GB
Free disk space	25 GB	30 or more GB

These recommendations assume you are running only one VM at a time. You need more resources on your system if you plan on running multiple VMs at the same time or run a VM along with several other apps. Keep in mind that these resource recommendations are guidelines. They are not rules, so you may need a little more or a little less.

After you have your host system properly outfitted with resources, it's time to start downloading software. We'll cover those steps in the next section.