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It seems rtabmap_ros is linking on a rtabmap library built without g2o and gtsam support. g2o and gtsam builds should work on ROS2 (it is independent of ros). The ROS2 binaries should have g2o dependency. You can try to debug which rtabmap is on the PATH:

$ which rtabmap

and check version and dependencies of that version:

$ rtabmap --version

This could help in case you have multiple rtabmap versions installed.

It seems rtabmap_ros is linking on a rtabmap library built without g2o and gtsam support. g2o and gtsam builds should work on ROS2 (it is independent of ros). The ROS2 binaries should have g2o dependency. You can try to debug which rtabmap is on the PATH:

$ which rtabmap

rtabmap

and check version and dependencies of that version:

$ rtabmap --version

--version

This could help in case you have multiple rtabmap versions installed. installed.