Installing pygal under Ubuntu 18.04

[Gribouillis]

Here is what I did to make your script work in kubuntu 16.04:

Replace the line pie_chart.render() with pie_chart.render_png('foo.png')

Replace Bar with Pie

In a terminal, run the commands

Output:
sudo apt install python3-cairosvg
pip3 install --user lxml
pip3 install --user tinycss
pip3 install --user cssselect

Finally, run the program with

Output:
python3 foobarbaz.py && xdg-open foo.png