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The directory /opt/ros/foxy
comes from installing Foxy from Debian packages. If, instead, you installed Foxy from the fat archive, then sourcing the setup.bash
file from the extracted location is all you should have to do. I.e. you don't have to source /opt/ros/foxy/setup.bash
, instead source ~/ros2_foxy/ros2-linux/setup.bash
is equivalent.