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Previously, launching a sandbox on a machine without the backend binary died with a raw "not installed" error and no path forward. Now the missing backend can be installed in-line, gated on explicit consent, so a fresh checkout can go from zero to a running sandbox without leaving the TUI. Folded into the existing `/sbx launch` verb rather than a new command (menu is already dense): `/sbx launch docker|multipass [image] install`. The `install` token opts in; without it the user gets an actionable error naming the exact retry. The token is filtered out of positional image parsing so it never shadows a custom image. The install runs off-thread inside the existing spawn_launch task, before provisioning, so the TUI never blocks and the *launching guard is cleared via BrokerMsg on failure. A fresh Docker install also leaves its daemon up, so launch proceeds straight through. Scripts (detect-first, never silent, --plan dry-run, idempotent if already present): - ensure-multipass.sh (new): Linux→snap (clear failure if snapd absent), macOS→brew cask, Windows→winget. - ensure-docker.sh: new --install mode using Docker's OFFICIAL, GPG-verified apt repo (docker-ce) on Debian/Ubuntu, with dnf (Fedora/RHEL) and pacman (Arch) fallbacks. Deliberately avoids piping get.docker.com into a root shell. Existing daemon-start path intact. sbx.rs: docker_installed()/multipass_installed() detectors and ensure_docker_install()/ensure_multipass_install() wrappers; ENSURE_MULTIPASS const. ui.rs: help text documents the [install] option on both backends. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>