Why is not created the install_aarch64/share directory? - cross compile tool

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Hi, I want to compile a ROS2 foxy demo in my pc running a VM with Linux Ubuntu 18.04 and then run it in my 64 bits arm processor running Linux Ubuntu 20.04 arm64, I am using this tool, I install the prerequisites, when I install docker I use this method and then I use this steps to run containers as a non-root user as mentioned in the prerequisites part:

Prerequisites

This tool requires that you have already installed

Docker Follow the instructions to add yourself to the docker group as well, so you can run containers as a non-root user

Python 3.6 or higher

then I install the ross cross compile and follow this tutorial, everything goes ok but I realize 2 things:

1.- the expected outputs are not the same I don´t have the tutorial.repos

2.- the install_aarch64/share path is not created, I realize this when I try to run the build in my target, in this step:

rosdep install --from-paths install_aarch64/share --ignore-src --rosdistro foxy -y

I got an error that says that the install_aarch64/share directory does not exists and wen I enter In the install_aarch64 directory I can confirm that

what could be the problem?