diff --git a/scripts/install-grub-theme.sh b/scripts/install-grub-theme.sh
new file mode 100644
index 0000000..ef604b3
--- /dev/null
+++ b/scripts/install-grub-theme.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+# Installe/met a jour le theme GRUB tactile pour triple boot
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+THEME_SRC="$SCRIPT_DIR/grub-theme"
+THEME_DEST="/boot/grub/themes/terra"
+
+if [ "$EUID" -ne 0 ]; then
+  echo "Ce script doit etre execute en root (sudo)"
+  exit 1
+fi
+
+if [ ! -d "$THEME_SRC" ]; then
+  echo "Dossier grub-theme non trouve dans $SCRIPT_DIR"
+  exit 1
+fi
+
+echo "=== Installation du theme GRUB tactile ==="
+
+# Copier le theme
+mkdir -p "$THEME_DEST/icons"
+cp "$THEME_SRC/theme.txt" "$THEME_DEST/"
+cp "$THEME_SRC/background.png" "$THEME_DEST/"
+cp "$THEME_SRC/select_"*.png "$THEME_DEST/"
+cp "$THEME_SRC/icons/"*.png "$THEME_DEST/icons/"
+
+# Installer les polices
+apt-get install -y -qq fonts-dejavu-core 2>/dev/null || true
+grub-mkfont -s 18 -o /boot/grub/fonts/DejaVuSans18.pf2 /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf 2>/dev/null || true
+grub-mkfont -s 24 -o /boot/grub/fonts/DejaVuSansBold24.pf2 /usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf 2>/dev/null || true
+grub-mkfont -s 36 -o /boot/grub/fonts/DejaVuSansBold36.pf2 /usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf 2>/dev/null || true
+grub-mkfont -s 42 -o /boot/grub/fonts/DejaVuSansBold42.pf2 /usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf 2>/dev/null || true
+
+# Configurer GRUB
+sed -i '/^GRUB_THEME=/d' /etc/default/grub
+sed -i '/^GRUB_GFXMODE=/d' /etc/default/grub
+sed -i '/^GRUB_GFXPAYLOAD_LINUX=/d' /etc/default/grub
+sed -i 's/^GRUB_TIMEOUT=.*/GRUB_TIMEOUT=-1/' /etc/default/grub
+
+cat >> /etc/default/grub <<EOF
+GRUB_THEME=/boot/grub/themes/terra/theme.txt
+GRUB_GFXMODE=1920x1080,auto
+GRUB_GFXPAYLOAD_LINUX=keep
+EOF
+
+# Mettre a jour GRUB
+update-grub
+
+echo ""
+echo "=== Theme GRUB installe ==="
+echo "Redemarrer pour voir le resultat."