The easiest way to get started with Mininet is to download a prepackaged VM image of Mininet (which runs over Ubuntu). This VM includes all OpenFlow binaries and preinstalled tools to support large Mininet networks along with Mininet itself. In addition to prepackaged VM installation, those of you interested can install it natively from the source code or packages on Ubuntu.
If you want to get the VM image, you have to download and install a virtualization system. VirtualBox (free, GPL) or VMware Player (free for non-commercial use) are the available choices, which ...