I have an old laptop in which I'd like to install Ubuntu Server 22.04 and provision it automatically with a cloud-init template. I've been doing this for some time with a Raspberry Pi 4, whose Ubuntu image already comes with an accessible user-data file that you can modify to your liking before booting it for the first time (https://ubuntu.com/download/raspberry-pi).
However it's not clear to me at all how to do this with a run of the mill x86_64 box. I know that Ubuntu Server comes preinstalled with cloud-init and that the installation program (subiquity?) uses it for some of the tasks (like creating your main user), but I have no clue how to feed cloud-init my own user-data and execute on the next boot. Or provide the template during the installation process so that it runs on first boot, like an EC2 instance would. Just to clarify I'm not interested in autoinstall. I don't mind running the Ubuntu installation wizard manually. What I want to automate is the post-installation setup (adding third party PPAs, installing packages, creating files and users etc.)
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