ubuntu-autoinstall

# ubuntu-autoinstall Autoinstall is the configuration format for Ubuntu Server's **Subiquity** installer. A `version: 1` document tells the installer how to partition, install, and configure the system unattended. This skill is authoring-led (produce a correct autoinstall config from a description) with a strong validation/debug path, aimed at **unattended on-prem / air-gapped Ubuntu Server LTS** installs. Autoinstall **nests the other two domains**: - its `network:` key is **netplan v2** → use the **ubuntu-netplan** skill; - its `user-data:` key is **cloud-config for the installed system** → use the **ubuntu-cloud-init** skill; - and the config is itself **delivered via cloud-init NoCloud**. See **The two delegation boundaries** and **Delivery**. ## Authoring workflow 1. **Pick the delivery method** (Delivery, below). Air-gapped → usually a NoCloud seed on the ISO/USB or an HTTP seed. 2. **Write the `version: 1` document.** `version` is the only schema-required key, but `identity` is required at *runtime* unless `user-data:` is present. 3. **Set the air-gapped essentials** — local mirror, proxy, offline fallback (see the Air-gapped essentials section below for the exact keys). 4. **Author `network:`** as netplan v2 (ubuntu-netplan skill) and any installed-system first-boot config under `user-data:` (ubuntu-cloud-init skill). 5. **Validate** with the subiquity repo's `validate-autoinstall-user-data.py` (see Validation — the script ships in the installer ...