ROS2 error running navigation example: package 'nav2_bringup' not found

I am trying to run the ros2 example for the navigation in isaac sim:
https://docs.omniverse.nvidia.com/app_isaacsim/app_isaacsim/sample_ros2_nav.html#running-nav2

Everything worked until the section ‘running-nav2’:
When I hit play again, rviz wont open and when I try to execute the command:
ros2 launch carter_navigation carter_navigation.launch.py

I get the following error:
`Caught exception when trying to load file of format [py]: "package 'nav2_bringup' not found, searching: ['/home/schmi/ros2_ws/install/isaac_ros2_messages', '/home/schmi/ros2_ws/install/carter_navigation', '/home/schmi/ros2_ws/install/carter_description', '/home/schmi/ros2_foxy/ros2-linux']"`

Why is it searching for a package ''nav2_bringup" in my workspace?

Thank you very much in advance

In the docs it said, that I should try the previous step again if it does not work. And I have done so now numerous times, to no avail

nav2_bringup is a dependency of the carter_navigation sample
ros2_samples/navigation/carter_navigation/package.xml

And should be installed when you setup your ros2 workspace
https://docs.omniverse.nvidia.com/app_isaacsim/app_isaacsim/ext_omni_isaac_ros_bridge.html#ros2-workspace