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To install Ubuntu Server as a VM, besides the hypervisor software (and the correct amount of resources on the host machine), you need an Ubuntu Server ISO image file. An ISO image file (also called an ISO image) is a specially formatted package file that contains all the files needed to boot a system. The Ubuntu Server ISO image file is used to boot and then install the distribution. In our case, we're installing it as a VM.

To get your hands on the Ubuntu Server ISO image file, go to ubuntu.com/download/server. If you are provided options for the download, choose the manual install option as shown in Figure 2.1.

You can start the process of downloading the ISO image file by clicking the Download button. Depending on the web browser you are using, you may have to deal with some pop‐up windows that want to confirm it is OK to download this file.

Since the ISO file is large, it's important to verify that no corruption has occurred while the software was downloading. If you have a corrupt ISO image file, you'll need to download the file again.

FIGURE 2.1 Option to choose an Ubuntu Server ISO image file download