Installation of Intel-ros2 on ubuntu (Ubuntu 18.04.5 LTS)(RDK)

[MrMoe830]

Hi friend! I'm trying to install the Intel-ROS2 project while it's easier to work with my D455 camera and L515 camera, I saw it herelink
And I found this document
, when I followed the steps in 'Installation' step by step to run the command in Ubuntu18.04 (kernel version: Linux4.15) terminal, I found that in my rdk_ws folder there is a missing file called Subfolder of 'turtlebot3_ws'.
I don't know if this is because my system version is too low, I would like to ask if you have understood it, and if you know how to deal with this situation.

When I run this commend./demo/rdk_install.sh ,the terminal prompt fails with this message
Err:4 http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo bionic InRelease 403 Forbidden [IP: 52.218.46.73 80]

When I switch back to manual and enter [./rdk.sh sync-src --force]
[2022-03-27 13:27:36][sync_src.sh:84][WARN] /home/mrmoe/robot_devkit-master/packages/turtlebot3/repos directory does not exist

When I run the commendsudo apt-get update, the following information will be displayed:
Failed to fetch http://realsense-hw-public.s3.amazonaws.com/Debian/apt-repo/dists/bionic/InRelease Could not connect to realsense-hw-public.s3.amazonaws.com:80 (52.218.65.73), connection timed out
When I followed the prompts to find the files I needed, I found that there was no corresponding file in the folder, and there seemed to be no the file in the robot_devkit folder in the repository.
thanks