The best way to install Mininet is to check out the newest Github repository:

cd ~                   # if you are in some other directory
git clone git://github.com/mininet/mininet 
cd mininet
git tag                # this will list available versions
git checkout -b 2.2.2  # replace 2.2.2 with the version you wish to install
cd ..

In this case the newest version of Mininet is 2.2.2. By executing the next command it can be installed.

./mininet/util/install.sh -a  # default installation, includes all components, recommended

Fehlermeldung (Ubuntu 16.05LTS): Cannot find required executable ovs-controller.

sudo apt-get install openvswitch-testcontroller
sudo cp /usr/bin/ovs-testcontroller /usr/bin/ovs-controller
 
sudo apt-get install openvswitch-switch