diff --git a/README.md b/README.md
index 8331999..bd35014 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,17 @@ npm run dev
 
 Then open [http://localhost:3000](http://localhost:3000).
 
+### One-shot setup on Debian/Ubuntu
+
+`install-dependencies-deb.sh` installs the system packages, Node.js LTS (>= 20.9.0) and npm,
+then runs `npm install` and `npm run build`:
+
+```bash
+./install-dependencies-deb.sh              # system deps + npm install + build
+./install-dependencies-deb.sh --no-build   # system deps + npm install only
+./install-dependencies-deb.sh --no-npm     # system packages only
+```
+
 ### Scripts
 
 ```bash
diff --git a/install-dependencies-deb.sh b/install-dependencies-deb.sh
new file mode 100755
index 0000000..6226429
--- /dev/null
+++ b/install-dependencies-deb.sh
@@ -0,0 +1,131 @@
+#!/usr/bin/env bash
+#
+# install-dependencies-deb.sh
+#
+# Installs everything needed to build and run this project on Debian/Ubuntu:
+#   - system packages (git, curl, build tools, ...)
+#   - Node.js LTS (>= 20.9.0, required by Next.js 16) + npm
+#   - project dependencies via `npm install`
+#   - a production build via `npm run build`
+#
+# Usage:
+#   ./install-dependencies-deb.sh            # install deps + npm install + npm run build
+#   ./install-dependencies-deb.sh --no-build # install deps + npm install only
+#   ./install-dependencies-deb.sh --no-npm   # system packages only
+#
+set -euo pipefail
+
+MIN_NODE_MAJOR=20
+MIN_NODE_MINOR=9
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DO_NPM=1
+DO_BUILD=1
+
+usage() {
+  cat <<'EOF'
+install-dependencies-deb.sh — set up everything needed to build/run this project.
+
+Installs system packages, Node.js LTS (>= 20.9.0) + npm, then runs
+`npm install` and `npm run build`.
+
+Usage:
+  ./install-dependencies-deb.sh             system deps + npm install + build
+  ./install-dependencies-deb.sh --no-build  system deps + npm install only
+  ./install-dependencies-deb.sh --no-npm    system packages only
+  ./install-dependencies-deb.sh -h|--help   show this help
+EOF
+}
+
+for arg in "$@"; do
+  case "$arg" in
+    --no-npm)   DO_NPM=0; DO_BUILD=0 ;;
+    --no-build) DO_BUILD=0 ;;
+    -h|--help)  usage; exit 0 ;;
+    *)
+      echo "Unknown option: $arg" >&2
+      exit 1
+      ;;
+  esac
+done
+
+log()  { printf '\n\033[1;34m==>\033[0m %s\n' "$*"; }
+warn() { printf '\033[1;33mwarning:\033[0m %s\n' "$*" >&2; }
+die()  { printf '\033[1;31merror:\033[0m %s\n' "$*" >&2; exit 1; }
+
+# --- must be Debian/Ubuntu ------------------------------------------------
+if [ ! -f /etc/os-release ]; then
+  die "Cannot detect the OS (missing /etc/os-release). This script is for Debian/Ubuntu."
+fi
+# shellcheck disable=SC1091
+. /etc/os-release
+case "${ID:-}${ID_LIKE:-}" in
+  *debian*|*ubuntu*) ;;
+  *) warn "Detected '${PRETTY_NAME:-unknown OS}', not Debian/Ubuntu. Continuing anyway." ;;
+esac
+
+# --- root / sudo helper ---------------------------------------------------
+if [ "$(id -u)" -eq 0 ]; then
+  SUDO=""
+elif command -v sudo >/dev/null 2>&1; then
+  SUDO="sudo"
+else
+  die "Not root and 'sudo' is not installed. Re-run as root."
+fi
+
+# --- system packages ------------------------------------------------------
+log "Updating apt package lists"
+$SUDO apt-get update -y
+
+log "Installing base system packages"
+$SUDO apt-get install -y --no-install-recommends \
+  ca-certificates \
+  curl \
+  gnupg \
+  git \
+  build-essential \
+  python3 \
+  make \
+  g++
+
+# --- node.js --------------------------------------------------------------
+node_ok() {
+  command -v node >/dev/null 2>&1 || return 1
+  local major minor
+  major="$(node -p 'process.versions.node.split(".")[0]' 2>/dev/null || echo 0)"
+  minor="$(node -p 'process.versions.node.split(".")[1]' 2>/dev/null || echo 0)"
+  if [ "$major" -gt "$MIN_NODE_MAJOR" ] || { [ "$major" -eq "$MIN_NODE_MAJOR" ] && [ "$minor" -ge "$MIN_NODE_MINOR" ]; }; then
+    return 0
+  fi
+  return 1
+}
+
+if node_ok; then
+  log "Node.js $(node -v) already satisfies >= ${MIN_NODE_MAJOR}.${MIN_NODE_MINOR}.0"
+else
+  if command -v node >/dev/null 2>&1; then
+    warn "Node.js $(node -v) is too old for Next.js 16; installing current LTS."
+  fi
+  log "Installing Node.js LTS from NodeSource"
+  curl -fsSL https://deb.nodesource.com/setup_lts.x | $SUDO -E bash -
+  $SUDO apt-get install -y nodejs
+fi
+
+node_ok || die "Node.js is still below ${MIN_NODE_MAJOR}.${MIN_NODE_MINOR}.0. Check 'node -v'."
+command -v npm >/dev/null 2>&1 || die "npm was not installed alongside Node.js."
+log "Using node $(node -v) / npm $(npm -v)"
+
+# --- project dependencies -------------------------------------------------
+if [ "$DO_NPM" -eq 1 ]; then
+  [ -f "$SCRIPT_DIR/package.json" ] || die "package.json not found in $SCRIPT_DIR."
+  log "Installing project dependencies (npm install)"
+  ( cd "$SCRIPT_DIR" && npm install )
+
+  if [ "$DO_BUILD" -eq 1 ]; then
+    log "Building the project (npm run build)"
+    ( cd "$SCRIPT_DIR" && npm run build )
+  fi
+fi
+
+log "Done."
+printf 'Start the dev server with:\n  cd %s && npm run dev\n' "$SCRIPT_DIR"