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Hi Sergio,
You can use whatever method to start xvfb, including python's subprocess module.
However, if you start it like that it won't affect the already active python session.
To do that, you need to make sure that whatever DISPLAY port is configured with xvfb is also set in the current python session environment.
Setting something like `os.environ["DISPLAY"] = port` and afterwards importing ete3 should work as expected.
Best,
Renato
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