Install the following Ubuntu/Debian package dependencies before continuing:
sudo apt-get install python-distutils-extra python-cairo-dev libtiff5-dev \
libcairo2-dev libglib2.0-dev python2.7-dev python-zbar python-gi \
python-gi-cairo gir1.2-gtk-3.0 pdftk python-pypdf python-reportlab \
python-imaging