Comment 3 for bug 1555658

# apt-cache policy python-six
python-six:
  Installed: 1.5.2-1ubuntu1
  Candidate: 1.5.2-1ubuntu1
  Version table:
 *** 1.5.2-1ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.5.2-1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

I had to install these packages in order to get the pip install working:

python-pip python-dev libpq-dev python-numpy

After doing a "pip install -U six", the config-generator works fine indeed with six=1.10.0 installed.