Why am am I still getting "E: Unable to locate package python-networkx" and "E: Unable to locate package python-pystache"?

Question

I am a beginner trying to learn Linux because my work requires me to do so. Currently I am tasked with setting up a Celadon compile machine. Following the steps given here , I am getting this two messages when following step 2.

 E: Unable to locate package python-networkx
 E: Unable to locate package python-pystache

Reading up more on it I tried doing sudo apt-add-repository universe and it shows:

'universe' distribution component is already enabled for all sources.

Can someone explain why it is unable to locate the package for me?

Answer 1

Try using

sudo apt install python3.networkx

sudo apt install python3-pystache