For this recipe, I'll use the 64-bit version of the Ubuntu virtual machine, but this should also work on the 32-bit version as well. If VirtualBox isn't open or running, go ahead and start it now. Once started, run either the 32-bit or 64-bit version of the Ubuntu virtual machines, and when the VM is running, start the Terminal application, and change the current working directory to ~/bac/Binary-Analysis-Cookbook/Chapter-04/src. As long as there were no errors, we're ready to begin.