ubuntu_22 : ROS2_humble :/usr/include/pcl_conversions/pcl_conversions.h:fatal error: pcl/conversions.h: No such file or directory

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Did you try to sudo apt-get install ros-humble-pcl-conversions? It is not in the base packages, I think.

1. My solution: CMake find_package(pcl_conversions REQUIRED) target_include_directories(${PROJECT_NAME} PUBLIC ${pcl_conversions_INCLUDE_DIRS} )
2. analysis：Unable to find pcl_conversions The dependency of conversions,It belongs to ROS。 shell $ ll /opt/ros/humble/include/ |grep pcl drwxr-xr-x 2 root root 4096 4moon 3 12:37 grid_map_pcl/ drwxr-xr-x 2 root root 4096 4moon 3 11:58 pcl_conversions/ drwxr-xr-x 3 root root 4096 4moon 3 11:58 pcl_msgs/ drwxr-xr-x 8 root root 4096 4moon 3 12:36 pcl_ros/

Second answer:

Same problem: this time it depends on CV_ Bridge and image_ transport。 It seems that dependencies belonging to ROS will always be like this. I added these two lines in package.xml to solve the problem <depend>cv_bridge</depend> <depend>image_transport</depend> Dependencies related to ROS not only need to be added in the CMakeLists.txt file, but also in the package.xml file

Looks like apt installs to a weird place. I solved this by adding

include_directories(/opt/ros/humble/include)

in my make file.