I am trying to install ros on a raspberry pi 4 2GB with Ubuntu 20.04. I am going through the tutorial step by step. I started trying with rolling (for no real good reason) and had colcon crash. So I went to humble with the same result. By crash, I mean the installation is going along just fine and the system just stops: the mouse stops responding, I can't open a new ssh session, nothing. The only thing that I can do is reboot the pi.

The following screen dump shows the progress of the command. The number at the bottom is the timer. The number isn't the same each time I run but it's close. The second dump shows the results of running the "colon build" a second time.

I believe that this is basically the last step before I can start writing code for my actual little robot so any kind of fix or work around would be much appreciated.

wjr

 wjr@ros:~/ros2_ws$ colcon build --symlink-install [3.018s] WARNING:colcon.colcon_core.package_selection:Some selected packages are already built in one or more underlay workspaces:

     'examples_rclpy_minimal_action_server'  is in: /opt/ros/humble
     'examples_rclcpp_minimal_publisher' is in: /opt/ros/humble
     'examples_rclcpp_minimal_client' is in: /opt/ros/humble
     'examples_rclpy_minimal_subscriber' is in: /opt/ros/humble
     'examples_rclpy_minimal_service' is in: /opt/ros/humble
     'examples_rclcpp_multithreaded_executor' is in: /opt/ros/humble
     'examples_rclcpp_minimal_service' is in: /opt/ros/humble
     'examples_rclpy_minimal_publisher' is in: /opt/ros/humble
     'examples_rclcpp_minimal_subscriber' is in: /opt/ros/humble
     'examples_rclpy_minimal_action_client' is in: /opt/ros/humble
     'examples_rclcpp_minimal_action_server' is in: /opt/ros/humble
     'examples_rclpy_executors' is in: /opt/ros/humble
     'examples_rclpy_minimal_client' is in: /opt/ros/humble
     'examples_rclcpp_minimal_action_client' is in: /opt/ros/humble
     'examples_rclcpp_minimal_composition' is in: /opt/ros/humble
     'examples_rclcpp_minimal_timer' is in: /opt/ros/humble 
 If a package in a `merged underlay workspace is overridden and it installs headers, then all packages in the overlay must sort their include directories by workspace order. Failure to do so may result in build failures or undefinedbehavior at run time. 
 If the overridden package is used by another package in any underlay, then the overriding package in the overlay must be API and ABI compatible or undefined behavior at run time may occur.

 If you understand the risks and want to override a package anyways, add the following to the command line:
         --allow-overriding 
     examples_rclcpp_minimal_action_client
     examples_rclcpp_minimal_action_server
     examples_rclcpp_minimal_client
     examples_rclcpp_minimal_composition
     examples_rclcpp_minimal_publisher
     examples_rclcpp_minimal_service
     examples_rclcpp_minimal_subscriber
     examples_rclcpp_minimal_timer
     examples_rclcpp_multithreaded_executor
     examples_rclpy_executors
     examples_rclpy_minimal_action_client
     examples_rclpy_minimal_action_server
     examples_rclpy_minimal_client
     examples_rclpy_minimal_publisher
     examples_rclpy_minimal_service
     examples_rclpy_minimal_subscriber

 This may be promoted to an error in a future release of colcon-override-check. 
 Starting >>> examples_rclcpp_async_client 
 Starting >>> examples_rclcpp_cbg_executor 
 Starting >>> examples_rclcpp_minimal_action_client
 Starting >>> examples_rclcpp_minimal_action_server
 [Processing: examples_rclcpp_async_client, examples_rclcpp_cbg_executor, examples_rclcpp_minimal_action_client,     examples_rclcpp_minimal_action_server]
 [53.1s] [0/22 complete] [4 ongoing] [examples_rclcpp_async_client:build 50% - 51.7s] ...

---

 wjr@ros:/usr/bin$ colcon build --symlink-install 
 Traceback (most recent call last):   
  File "/usr/bin/colcon", line 11, in <module>
     load_entry_point('colcon-core==0.10.0','console_scripts', 'colcon')()   
  File "/usr/lib/python3/dist-packages/colcon_core/command.py", line 118, in main
     return _main(command_name=command_name, argv=argv)   
  File "/usr/lib/python3/dist-packages/colcon_core/command.py", line 185, in _main
     create_log_path(args.verb_name)   
  File "/usr/lib/python3/dist-packages/colcon_core/location.py", line 186, in create_log_path
     os.makedirs(str(path))   
  File "/usr/lib/python3.10/os.py", line 215, in makedirs
     makedirs(head, exist_ok=exist_ok)   
  File "/usr/lib/python3.10/os.py", line 225, in makedirs
     mkdir(name, mode) 
  PermissionError: [Errno 13] Permission denied: 'log'

sudo su