ubuntu-netplan

# ubuntu-netplan Netplan is Ubuntu's network-configuration abstraction: declarative YAML under `/etc/netplan/` that netplan renders to a backend — **systemd-networkd** (servers, the default) or **NetworkManager** (desktop) — and uses to bring the network up. This skill is authoring-led (produce correct YAML from a description) with a strong validation/debug path, aimed at **on-prem / air-gapped Ubuntu Server LTS**. Netplan is also the shared network substrate for the sibling skills: cloud-init's network-config **v2 is netplan format**, and an autoinstall `network:` block **is** netplan v2. See **Boundaries** at the end. ## Authoring workflow 1. **Confirm target & renderer.** Server → `renderer: networkd` (the default). Desktop/Wi-Fi → `renderer: NetworkManager`. Check the running version with `netplan info` (24.04 ships ~1.0.x, 26.04 tracks 1.2.x — see version notes). 2. **Pick the device type(s):** `ethernets`, `bonds`, `bridges`, `vlans`, `vrfs`, `tunnels`, `dummy-devices`, `virtual-ethernets`, `wifis`, `modems`. Stack them bottom-up: ethernets → bond → vlans-on-bond → bridges-on-bond/vlan. 3. **Write the YAML** under `/etc/netplan/`, choosing a filename that orders correctly (see precedence). Use 2-space indentation, **never tabs**. 4. **Validate** without applying: `netplan generate` (fails loudly on errors). 5. **Apply safely.** On a remote/SSH host use `netplan try` (auto-rollback), never a blind `netplan apply` — see "Apply safely". 6. **Verify:**...