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Short answer? maybe.

ROS 2 Galactic officially targets Ubuntu 20.04. We don't regularly run any builds or tests and we don't distribute any pre-built binaries for any other version of Ubuntu. That doesn't mean that we've consciously broken compatibility with 18.04, but I wouldn't be surprised to hear that you need to make changes to the sources to make it work there.

This has little to do with the capabilities of Docker and more to do with the differences between Ubuntu releases, and the decision to target only one of them under each ROS distribution.

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