# --------------------------------------------------------- # inside ubuntu 

apt-get install python-is-python3 gir1.2-gtk-3.0 python3-gi python3-xdg python3-pillow 

apt-get install pkg-config libcairo2-dev 

# https://stackoverflow.com/questions/18025730/pygobject-2-28-6-wont-configure-no-package-gobject-introspection-1-0-found
# No package 'gobject-introspection-1.0' found
apt-get install libgirepository1.0-dev

# --------------------------------------------------------- # inside virtualenv

pip install gobject-introspection-1.0 pygobject