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→Prerequisites: request from https://www.reddit.com/r/gramps/comments/5z1gtj/show_all_database_entries_in_a_graphical_report/deuym8w/
pip install pygraphviz
===Troubleshooting[https://www.reddit.com/r/gramps/comments/5z1gtj/show_all_database_entries_in_a_graphical_report/deuym8w/]===
You can check if networkx and pygraphviz installed correctly by starting python (type python3 if system default is still python 2) and attempt to import both packages eg:
python3
import networkx
If no error occurs then networkx is fine
then try
import pygraphviz
If no error occurs then pygraphviz is fine
If you receive any error, correct the issue and test again.
==Usage==