Mininet Installation

See also: http://mininet.org/download/

- There are four methods to install Mininet.
  Option 1: Mininet VM Installation (easy, recommended)
  Option 2: Native Installation from Source
  Option 3: Installation from Packages
  Option 4. Upgrading an existing Mininet Installation
- I already have a new-installed Ubuntu virtual machine, so I choose option 2. ( ubuntu version Ubuntu 15.10)
- First of all, install git by "apt-get install git". An error message shows: "liberror - perl but it is not installable". By http://askubuntu.com/questions/453695/ubuntu-14-04-git-install-problem, run

sudo apt-get update; sudo apt-get upgrade; sudo apt-get install -f

to download needed packages and install git successfully.
- Copy mininet source form git: "git clone git://github.com/mininet/mininet"

- Install it! "mininet/util/install.sh -a"
- Test the basic functionality. "sudo mn --test pingall"
- Congratulations! Mininet is set up!