I have my own ISO based on Ubuntu 22.04 that I generated myself. Here is my Autoinstall -

#cloud-config

autoinstall:

  version: 1

  identity:

    hostname: foo-ubuntu

    password: "ToReplace"

    username: abcabc

  source:

    id: ubuntu-server-minimal

  early-commands:

  - cat /cdrom/casper/install-sources.yaml | awk 'NR>1 && /^-/{exit};1' > /run/my-sources.yaml

  - mount -o ro,bind /run/my-sources.yaml /cdrom/casper/install-sources.yaml

  late-commands:

    - cp -r /cdrom/copy_to_iso/ /target/opt/

  user-data:

    runcmd:

      - |

        mkdir -vp /opt/INIT/

        mv -v /opt/copy_to_iso/upgrade_or_install_packages/ /opt/

        mv -v /opt/copy_to_iso/foo_installation/* /opt/INIT/ 

        mv -v /opt/copy_to_iso/abc_scripts /opt/abc_scripts

        rm -rvf /opt/copy_to_iso

        bash -x /opt/abc_scripts/copy_system_files.sh

        bash -x /opt/abc_scripts/setup_system_config.sh install_mode

During early-commands and late-commands, I have a local repository with all the needed packages under /cdrom/copy_to_iso/packages. During the user-data section, the location is /opt/packages.

When I install the ISO on a server without an internet connection, the installation ends perfectly well, and all the necessary packages are installed. On the other hand, when I install the ISO on a server with internet connection, I see in the logs that it found a more up-to-date package externally in the internet, and it makes the section of installing the packages from /opt/packages fail.

I saw some related questions on the internet, but I wish to make all the sections in autoinstall work only with my local repository. Here is something that I tried -

how to disable unattended-upgrades during autoinstall (user-data, cloud-config)

Please look on "alternate option to use your local mirror". My problem is that I don't work with http in my local repository, but with "file".

I tried -

#cloud-config

autoinstall:

  apt:

  disable_components: [restricted,multiverse]

  disable_suites: [backports,security]

    primary:

    - arches:

      - default

      uri: file:///cdrom/copy_to_iso/packages/

and also file:/cdrom/copy_to_iso/packages/ - nothing works, and it still installs packages from external repositories.

How should I write it in my case?