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As I wrote in my comment: installing both Melodic and Noetic on the same Debian/Ubuntu OS version is not supported, as there are no binary packages available for those ROS versions which support the same Debian Ubuntu version.

If/when people need to run Melodic on Ubuntu Focal (which only supports Noetic), I've seen Docker or other container approaches (such as Singularity, or LXC) used.

A from-source build could work, but it's not going to be a smooth experience, and is not something I would recommend to someone just starting out with ROS.

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