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Local AI isn’t inherently safe. This guide hardens Linux on‑device models with practical, cross‑distro steps: verify downloads (checksums/GPG), sandbox file access (firejail/bubblewrap), block egress by default (sandbox flags or nftables + dedicated user), use rootless Podman with read‑only mounts and dropped caps, and sanitize/encrypt data—yielding safe‑by‑default local workflows.