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This is likely related to slam_toolbox's (which is an exec dependency of nav2_bringup) dependence on open_karto. Have you run rosdep install -q -y -r --from-paths src --ignore-src. Is slam_toolbox installed on your system? (apt install ros-foxy-slamtoolbox).

As to whether or not this is a "critical" error, it depends if you want to use the functionality offered by these libraries. Non-slam functionality will likely still work just fine.