Add one-line installer (curl | bash) for Ubuntu/Debian

install-linux.sh: standalone script that clones from GitHub, builds
the .deb, installs it with apt, and cleans up. Works on any
Ubuntu/Debian machine with a single curl command.

README: add the one-liner as the primary install option (Option A).

README.md

@@ -90,9 +90,17 @@ Stream:    hotkey → mic PCM chunks → Riva/NIM WebSocket → live words typed
 
 ## Installation & Setup
 
-### Option A — Debian Package (recommended for Ubuntu/Debian)
+### Option A — One-line installer (recommended)
 
-Build a `.deb` and install it. No pip, no network needed at install time:
+Install on any Ubuntu/Debian machine with a single command:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/mARTin-B78/blitztext-app-linux/main/install-linux.sh | bash
+```
+
+This clones the repo, builds a `.deb`, installs it with `apt` (pulling in all dependencies), and cleans up. After it finishes, **Blitztext** appears in your app grid.
+
+### Option B — Build the Debian package yourself
 
 ```bash
 git clone https://github.com/mARTin-B78/blitztext-app-linux.git
@@ -103,7 +111,7 @@ sudo apt install ./dist/blitztext_*.deb
 
 This installs Blitztext to `/opt/blitztext`, adds a **Blitztext** entry to your application menu, installs the app icon, and pulls in system dependencies automatically. Remove with `sudo apt remove blitztext`.
 
-### Option B — Run from Source (venv)
+### Option C — Run from Source (venv)
 
 ```bash
 git clone https://github.com/mARTin-B78/blitztext-app-linux.git

install-linux.sh

@@ -0,0 +1,100 @@
+#!/usr/bin/env bash
+# Install Blitztext for Linux from GitHub.
+#
+# Usage (any Ubuntu/Debian machine):
+#   curl -fsSL https://raw.githubusercontent.com/mARTin-B78/blitztext-app-linux/main/install-linux.sh | bash
+#
+# Or clone first and run locally:
+#   git clone https://github.com/mARTin-B78/blitztext-app-linux.git
+#   bash blitztext-app-linux/install-linux.sh
+#
+# What it does:
+#   1. Installs build tools (git, fakeroot, dpkg-dev) if missing
+#   2. Clones the repo to a temp directory
+#   3. Builds a .deb package
+#   4. Installs it with apt (pulls in all runtime dependencies)
+#   5. Cleans up the temp directory
+#
+# After install:
+#   - "Blitztext" appears in your app grid
+#   - Or run: blitztext tray
+#   - Remove:  sudo apt remove blitztext
+set -euo pipefail
+
+REPO="https://github.com/mARTin-B78/blitztext-app-linux.git"
+BRANCH="main"
+
+# --- helpers ----------------------------------------------------------------
+info()  { echo -e "\033[1;34m==>\033[0m \033[1m$*\033[0m"; }
+ok()    { echo -e "\033[1;32m==>\033[0m \033[1m$*\033[0m"; }
+fail()  { echo -e "\033[1;31m==>\033[0m \033[1m$*\033[0m" >&2; exit 1; }
+
+command_exists() { command -v "$1" &>/dev/null; }
+
+# --- preflight --------------------------------------------------------------
+info "Blitztext for Linux — installer"
+
+# Detect package manager
+if command_exists apt; then
+    PKG=apt
+elif command_exists apt-get; then
+    PKG=apt-get
+else
+    fail "This installer requires apt (Ubuntu/Debian). For other distros, install from source: see the README."
+fi
+
+# Ensure we can sudo
+if ! sudo -n true 2>/dev/null; then
+    info "This installer needs sudo to install packages."
+    sudo true || fail "sudo failed."
+fi
+
+# --- install build dependencies ---------------------------------------------
+BUILD_DEPS=()
+command_exists git      || BUILD_DEPS+=(git)
+command_exists fakeroot || BUILD_DEPS+=(fakeroot)
+command_exists dpkg-deb || BUILD_DEPS+=(dpkg-dev)
+
+if ((${#BUILD_DEPS[@]})); then
+    info "Installing build tools: ${BUILD_DEPS[*]}"
+    sudo $PKG install -y "${BUILD_DEPS[@]}"
+fi
+
+# --- clone ------------------------------------------------------------------
+TMPDIR="$(mktemp -d)"
+trap 'rm -rf "$TMPDIR"' EXIT
+
+info "Cloning $REPO ($BRANCH)…"
+git clone --depth 1 --branch "$BRANCH" "$REPO" "$TMPDIR/blitztext-app-linux"
+
+# --- build .deb -------------------------------------------------------------
+info "Building .deb package…"
+LINUX_DIR="$TMPDIR/blitztext-app-linux/linux"
+OUT_DIR="$TMPDIR/out"
+mkdir -p "$OUT_DIR"
+OUT_DIR="$OUT_DIR" bash "$LINUX_DIR/packaging/build-deb.sh"
+
+DEB="$(ls "$OUT_DIR"/*.deb 2>/dev/null | head -1)"
+if [ -z "$DEB" ] || [ ! -f "$DEB" ]; then
+    fail "Build failed — no .deb produced."
+fi
+
+# --- install ----------------------------------------------------------------
+info "Installing $(basename "$DEB")…"
+sudo $PKG install -y "$DEB"
+
+# --- done -------------------------------------------------------------------
+VER="$(dpkg -s blitztext 2>/dev/null | grep '^Version:' | cut -d' ' -f2)"
+ok "Blitztext ${VER:-} installed!"
+echo ""
+echo "  Launch from your app grid, or run:"
+echo "    blitztext tray     # system tray (recommended)"
+echo "    blitztext gui      # control-panel window"
+echo "    blitztext run      # headless, hotkeys only"
+echo ""
+echo "  For rewrite workflows, set your API key first:"
+echo "    export OPENAI_API_KEY=sk-..."
+echo ""
+echo "  Remove:"
+echo "    sudo apt remove blitztext"
+echo ""