add GRUB timeout TUI and restructure boot menu

- Rename "Boot Rescue & Repair" to "Boot Rescue + GRUB"
- Add interactive GRUB timeout settings (Disable, 3s, 5s, Custom)
- Implement robust `_set_grub_var` and `_apply_grub_setting` helpers
- Add /etc/default/grub.d/99_script_override.cfg to bypass VM/Cloud-init overrides
- Handle Secure Boot countdown policy restrictions by using menu style
- Fix independent install check for lightdm and lightdm-gtk-greeter-settings

debianito.sh

@@ -67,7 +67,7 @@ main_menu() {
             "8" "ZRAM" \
             "9" "Swap Management" \
             "10" "Install Programs and Software" \
-            "11" "Boot Rescue & Repair" \
+            "11" "Boot Rescue + GRUB" \
             "12" "Desktop & Display" \
             "13" "Exit")
 

modules/desktop_display.sh

@@ -52,14 +52,20 @@ lightdm_config_menu() {
     for item in $cleaned; do
         case $item in
             install_lightdm)
-                if is_installed lightdm; then
+                if ! is_installed lightdm; then
-                    echo -e "${GREEN}LightDM is already installed.${NC}"
+                    _run_cmd "LightDM" "sudo apt install -y lightdm" "Installing LightDM..."
                 else
-                    _run_cmd "LightDM" "sudo apt install -y lightdm lightdm-gtk-greeter-settings" "Installing LightDM..."
+                    echo -e "${GREEN}[LightDM] already installed, skipping...${NC}"
+                fi
+                if ! is_installed lightdm-gtk-greeter-settings; then
+                    _run_cmd "LightDM Settings" "sudo apt install -y lightdm-gtk-greeter-settings" "Installing LightDM Settings..."
+                else
+                    echo -e "${GREEN}[LightDM Settings] already installed, skipping...${NC}"
                 fi
                 ;;
             enable_userlist)
                 local conf="/etc/lightdm/lightdm.conf.d/50-debianito-userlist.conf"
+                sudo mkdir -p "$(dirname "$conf")"
                 if echo "[Seat:*]
 greeter-hide-users=false" | sudo tee "$conf" > /dev/null; then
                     echo -e "${GREEN}User list enabled in LightDM.${NC}"

modules/rescue.sh

@@ -53,23 +53,136 @@ _rescue_initramfs() {
     _pause
 }
 
-rescue_boot() {
+# ----------------------------------------------------------------------
+# GRUB helpers
+# ----------------------------------------------------------------------
+
+_set_grub_var() {
+    local var="$1" val="$2" file="/etc/default/grub"
+    if grep -q "^${var}=" "$file" 2>/dev/null; then
+        sudo sed -i "s/^${var}=.*/${var}=${val}/" "$file"
+    elif grep -q "^#${var}=" "$file" 2>/dev/null; then
+        sudo sed -i "s/^#${var}=.*/${var}=${val}/" "$file"
+    else
+        echo "${var}=${val}" | sudo tee -a "$file" >/dev/null
+    fi
+}
+
+_apply_grub_setting() {
+    local timeout="$1" style="$2" recordfail="$3" os_prober="$4"
+    local file="/etc/default/grub"
+    local backup="${file}.backup.$(date +%Y%m%d_%H%M%S)"
+    local override="/etc/default/grub.d/99_script_override.cfg"
+
+    sudo cp "$file" "$backup"
+
+    _set_grub_var GRUB_TIMEOUT "$timeout"
+    _set_grub_var GRUB_TIMEOUT_STYLE "$style"
+    _set_grub_var GRUB_RECORDFAIL_TIMEOUT "$recordfail"
+    [ -n "$os_prober" ] && _set_grub_var GRUB_DISABLE_OS_PROBER "$os_prober"
+
+    sudo mkdir -p /etc/default/grub.d
+    if [ -n "$os_prober" ]; then
+        cat << EOF | sudo tee "$override" > /dev/null
+GRUB_TIMEOUT_STYLE=$style
+GRUB_TIMEOUT=$timeout
+GRUB_RECORDFAIL_TIMEOUT=$recordfail
+GRUB_DISABLE_OS_PROBER=$os_prober
+EOF
+    else
+        cat << EOF | sudo tee "$override" > /dev/null
+GRUB_TIMEOUT=$timeout
+GRUB_TIMEOUT_STYLE=$style
+GRUB_RECORDFAIL_TIMEOUT=$recordfail
+EOF
+    fi
+
+    local summary
+    summary="Settings applied:\n\n"
+    summary+="  GRUB_TIMEOUT=$timeout\n"
+    summary+="  GRUB_TIMEOUT_STYLE=$style\n"
+    summary+="  GRUB_RECORDFAIL_TIMEOUT=$recordfail\n"
+    [ -n "$os_prober" ] && summary+="  GRUB_DISABLE_OS_PROBER=$os_prober\n"
+    summary+="\nRunning update-grub..."
+
+    echo -e "$summary"
+
+    if sudo update-grub >/dev/null 2>&1; then
+        _msg "GRUB Settings" \
+            "GRUB settings applied successfully!\n\nBackup saved: ${backup}\n\nReboot to see the changes."
+    else
+        echo -e "${RED}update-grub failed. Restoring backup...${NC}"
+        sudo cp "$backup" "$file"
+        sudo rm -f "$override"
+        _msg "Error" "update-grub failed.\nBackup restored from ${backup}\nOverride removed: ${override}."
+    fi
+}
+
+_grub_menu_settings() {
     while true; do
         local choice
-        choice=$(_menu "Boot Rescue & Repair" \
+        choice=$(_menu "GRUB Boot Menu Settings" \
-            "Select a rescue operation${SCROLL_HINT}:" \
+            "Configure when and how the GRUB menu appears${SCROLL_HINT}:" \
             $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
-            "1" "Refirm Secure Boot (shim + GRUB)" \
+            "1" "Disable GRUB menu on start (Fastest boot)" \
-            "2" "Regenerate initramfs (all kernels)" \
+            "2" "Faster boot (Show 3-sec countdown)" \
-            "3" "Return to main menu")
+            "3" "Default boot (Show menu for 5 secs)" \
+            "4" "Custom timeout (Input seconds)" \
+            "5" "Back")
 
         [ -z "$choice" ] && return
         clear
 
         case "$choice" in
-            1) _rescue_boot_sb ;;
+            1)
-            2) _rescue_initramfs ;;
+                if _confirm "Disable GRUB Menu" \
-            3) return ;;
+                    "GRUB menu will be hidden entirely for fastest boot.\n\nTo access the menu on next boot, press and hold ESC\nimmediately after powering on.\n\nProceed?"; then
+                    _apply_grub_setting 0 hidden 0 true
+                fi
+                ;;
+            2)
+                _apply_grub_setting 3 menu 3 ""
+                ;;
+            3)
+                _apply_grub_setting 5 menu 5 ""
+                ;;
+            4)
+                local custom_timeout
+                custom_timeout=$(whiptail --title "Custom GRUB Timeout" \
+                    --inputbox "Enter the GRUB timeout in seconds.\n\nUse -1 for indefinite wait." \
+                    10 60 "" 3>&1 1>&2 2>&3 || true)
+                if [ -n "$custom_timeout" ]; then
+                    if [[ "$custom_timeout" =~ ^-?[0-9]+$ ]]; then
+                        _apply_grub_setting "$custom_timeout" menu "$custom_timeout" ""
+                    else
+                        _msg "Invalid Input" "Please enter a valid integer (e.g. 0, 5, -1)."
+                    fi
+                fi
+                ;;
+            5) return ;;
+        esac
+    done
+}
+
+rescue_boot() {
+    while true; do
+        local choice
+        choice=$(_menu "Boot Rescue + GRUB Configuration" \
+            "Select an operation${SCROLL_HINT}:" \
+            $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
+            "1" "GRUB Boot Menu Settings" \
+            "2" "Refirm Secure Boot (shim + GRUB)" \
+            "3" "Regenerate initramfs (all kernels)" \
+            "4" "Return to main menu")
+
+        [ -z "$choice" ] && return
+        clear
+
+        case "$choice" in
+            1) _grub_menu_settings ;;
+            2) _rescue_boot_sb ;;
+            3) _rescue_initramfs ;;
+            4) return ;;
         esac
     done
 }