Install Virtualbox on Ubuntu Host

In the icon bar, click on the suitcase icon with an "A" on it to open up Ubuntu software.

Click the magnifying glass icon at the top left of the page and search for "Virtualbox".

Click on "Virtualbox" in the list, then click on "Install".

Once the red "Trash" icon appears, Virtualbox is installed.

Click the "Windows" key on your keyboard and type "Virtualbox" to open it up.

Right click on Virtualbox to "Add to favorites" so that it'll remain in the icon bar even when closed. Drag it to your desired position.

This next part might seem scary, but it's actually super easy. Click on the Terminal app in your icon bar, then run the command sudo usermod -a -G vboxusers theophilus. Replace theophilus with the username you're logged in as. This will give you the ability to use USB devices with your VMs. Reboot.

However, if you look at a VM's settings, you'll see only USB 1.1 is available, we have to install virtualbox extensions first.

Go back to the terminal app and run the command sudo apt-get install virtualbox-ext-pack.

Oracle wants you to agree to terms and conditions before you use the extenstions. You may have to press an arrow key before you can press enter to go to the next popup.

Press the left arrow key and then the enter key to agree to the terms.

Once it's done installing, you can close the terminal window.