The current command on line 125 throws a permission error. The sudo elevation of rights applies to the containerd command, not the write (>) to a file owned by root.
This is the command as copied from the current page:
student@master:~$ sudo containerd config default > /etc/containerd/config.toml
-bash: /etc/containerd/config.toml: Permission denied
Instead leverage sudo tee. It works and no more error:
student@master:~$ containerd config default | sudo tee /etc/containerd/config.toml
serewicz
07a8b3315d