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When you write sudo -H pip install pygraphviz you try to install pygraphviz on your system, not within Sage witrual environment.

Could you try with sage -pip install pygraphviz and tell us what happens ?

When you write sudo -H pip install pygraphviz you try to install pygraphviz on your system, not within Sage witrual environment.

Could To install pygraphviz on your Sage installation, you try with should:

  • install the graphviz-dev package in your system
  • run the command sage -pip install pygraphviz and tell us what happens ?

When you write sudo -H pip install pygraphviz you try to install pygraphviz on your system, not within Sage witrual vitrual environment.

To install pygraphviz on your Sage installation, you should:

  • install the graphviz-dev package in your system
  • run the command sage -pip install pygraphviz