How to fix ROS2 Could not find the resource 'joint_state_publisher_gui' on Ubuntu

Problem

While running or launching your ROS package, you see the following error message:

File "/opt/ros/jazzy/lib/python3.12/site-packages/ament_index_python/packages.py", line 60, in get_package_prefix
    content, package_prefix = get_resource('packages', package_name)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/ros/jazzy/lib/python3.12/site-packages/ament_index_python/resources.py", line 93, in get_resource
    raise LookupError(
LookupError: Could not find the resource 'joint_state_publisher_gui' of type 'packages'

Solution

you need to install the joint-state-publisher-gui package using apt:

sudo apt -y install ros-jazzy-joint-state-publisher-gui