Primero Deben instalar pip3

Para ubuntu es

apt install python-pip3

Luego ejecutar el comando (como sudo)

# pip3 install dicttoxml lxml signxml cryptography pyOpenSSL pytz cchardet urllib3 xmltodict xlsxwriter requests pysftp pdf417gen xlrd num2words suds-py3 cffi certifi defusedxml

Para descargar wkhtmltopdf (para poder imprimir pdf)

wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.1/wkhtmltox-0.12.1_linux-trusty-amd64.deb

# dpkg -i wkhtmltox-0.12.1_linux-trusty-amd64.deb