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If I understood it correctly, you can only have 1 installation active at the same time, but both can be installed on the same system.

You can switch between the active installation via source /opt/ros/<hydro or fuerte>/setup.bash. You either enter this line in each new terminal you open, or you edit your /home/<your_username>/.bashrc to include corresponding source-command. In this case, it is sourced automaticly each time you open a terminal.

Please correct me if I am wrong.

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