Step 1: Have VirtualBox installed
I will be using lubuntu (Lightweight Ubuntu) for this purpose. But you can install any distro that you want (I will be using apt in the lab 1 preparation, so I recommend you to use the Debian based ones)
Follow this page if you are unsure of what version do you need.
Launch the VirtualBox on your host machine, and follow:
Also, you can additionally increase the video memory and enable 3D acceleration for your VM:

Select the VM and press Start button
Follow this guide if you are installing lubuntu, and if you are using other distro, just search for [your distro name] installation.