The nntoolkit toolkit can be installed via pip:
# pip install nntoolkit
However, you might have to install some packages first for scipy.
Debian-based systems are Ubuntu, Linux Mint, and of course Debian. If you have such a Linux system, then the following commands will help you to install the nntoolkit package.
# apt-get install python-pip libblas-dev liblapack-dev gfortran
# apt-get install python-scipy python-numpy
# apt-get install libhdf5-dev
# pip install numpy
# pip install scipy
# pip install future