rosdep can't find cyclonedds during foxy install on raspbian

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I have created a fresh raspbian system on as Pi3b. I have created a new user with sudo privileges, rebooted to new user and installed latest updates follow by a reboot. I am now trying to install ros2 following these instructions https://docs.ros.org/en/foxy/Installa... and using this image ros2-foxy-20201211-linux-focal-arm64.tar.bz2. When trying to install the dependencies I get :

robot@robot:~/ros2_foxy $ rosdep install --from-paths ros2-linux/share --ignore-src --rosdistro foxy -y --skip-keys "console_bridge fastcdr fastrtps osrf_testing_tools_cpp poco_vendor rmw_connext_cpp rosidl_typesupport_connext_c rosidl_typesupport_connext_cpp rti-connext-dds-5.3.1 tinyxml_vendor tinyxml2_vendor urdfdom urdfdom_headers"
ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
rmw_cyclonedds_cpp: No definition of [cyclonedds] for OS [debian]

Following a previous question I then proceed with the -r option and all seems to go OK until I try to run the demos when I get the following errors: talker

robot@robot:~ $ ros2 run demo_nodes_cpp talker
Traceback (most recent call last):
  File "/home/robot/ros2_foxy/ros2-linux/bin/ros2", line 33, in <module>
    sys.exit(load_entry_point('ros2cli==0.9.8', 'console_scripts', 'ros2')())
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8/site-packages/ros2cli/cli.py", line 67, in main
    rc = extension.main(parser=parser, args=args)
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8/site-packages/ros2run/command/run.py", line 70, in main
    return run_executable(path=path, argv=args.argv, prefix=prefix)
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8/site-packages/ros2run/api/__init__.py", line 61, in run_executable
    process = subprocess.Popen(cmd)
  File "/usr/lib/python3.7/subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.7/subprocess.py", line 1522, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 8] Exec format error: '/home/robot/ros2_foxy/ros2-linux/lib/demo_nodes_cpp/talker'

listener

robot@robot:~/ros2_foxy $ ros2 run demo_nodes_py listener
Traceback (most recent call last):
  File "/home/robot/ros2_foxy/ros2-linux/lib/demo_nodes_py/listener", line 33, in <module>
    sys.exit(load_entry_point('demo-nodes-py==0.9.3', 'console_scripts', 'listener')())
  File "/home/robot/ros2_foxy/ros2-linux/lib/demo_nodes_py/listener", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/home/robot/.local/lib/python3.7/site-packages/importlib_metadata/__init__.py", line 100, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8/site-packages/demo_nodes_py/topics/listener.py", line 16, in <module>
    from rclpy.node import Node
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8/site-packages/rclpy/node.py", line 41, in <module>
    from rclpy.client import Client
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8/site-packages/rclpy/client.py", line 22, in <module>
    from rclpy.impl.implementation_singleton import rclpy_implementation as _rclpy
  File "/home/robot/ros2_foxy/ros2-linux/lib/python3.8 ...