pygraphviz and other python 3 Packages Missing Error when building ns-3 with Bake on Ubuntu

bake.py show 
bake.py show
module…

--

--

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store