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If you are planning on installing the Ubuntu Server distribution directly on a computer's hardware, instead of creating a VM, you need to do one additional step after checking the ISO image file: create a bootable media device. While bootable DVDs were popular many years ago, most hardware installations can be handled through a bootable USB drive. The process of creating this bootable USB (or DVD) is called burning an ISO file to a USB drive.

You cannot just copy the file to the USB. Instead, you need a special software app that will burn the ISO properly. To find the right software, open your web browser and go to your favorite search engine. Type burn a bootable USB and press Enter. The resulting list will have several sites with instructions that point to free software. Once you have your Ubuntu Server ISO image file properly burned to a USB (or DVD) drive, you're able to boot your system and perform the installation process similar to what is covered in the next section.

Now that you've verified your copy of the Ubuntu Server ISO image file and downloaded the Oracle VirtualBox hypervisor software, you're ready to start the installation. We'll cover that process next.