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There is no specific 'default ROS_PACKAGE_PATH'. It would depend on your distribution and method of installing ROS. On my ubuntu machine, it is /opt/ros/diamondback/stacks
You might try running 'locate setup.bash' (or zsh) to find your ros installation if you do not know where it it. Sourcing that file ('source setup.bash') should set the appropriate package path for that ros installation.