diff --git a/README.md b/README.md
index 91d7b5f..d065e42 100644
--- a/README.md
+++ b/README.md
@@ -10,11 +10,11 @@ OrOpen the terminal at current directory.
 
 Run
 
-    ./Install
+    sudo ./Install
 
 By Root user
 
-### GRUB2
+## Screenshot
 ![01](https://github.com/vinceliuice/grub2-themes/blob/master/screenshot-vimix.jpeg?raw=true) 
 ![02](https://github.com/vinceliuice/grub2-themes/blob/master/screenshot-stylish.jpeg?raw=true) 
 
diff --git a/grub-themes-stylishdark/Install b/grub-themes-stylishdark/Install
index d577e39..f0f9c28 100755
--- a/grub-themes-stylishdark/Install
+++ b/grub-themes-stylishdark/Install
@@ -12,14 +12,12 @@ if [ "$UID" -eq "$ROOT_UID" ]; then
   echo "GRUB_THEME=\"/boot/grub/themes/StylishDark/theme.txt\"" >> /etc/default/grub
 
   # update grub
-  update-grub
+  grub-mkconfig -o /boot/grub/grub.cfg
 
-  echo -e "/n All done!"
-  notify-send "All done!" -i face-smile
+  echo -e "\n All done!"
 
 else
-  echo -e "/n Please run this script by root..."
-  notify-send "Please run this script by root..." -i notification
+  echo -e "\n Please run this script by root..."
 fi
 
 
diff --git a/grub-themes-vimix/Install b/grub-themes-vimix/Install
index 1848fcf..c95b0b5 100755
--- a/grub-themes-vimix/Install
+++ b/grub-themes-vimix/Install
@@ -2,6 +2,11 @@
 
 ROOT_UID=0
 
+# check command avalibility
+function has_command() {
+    command -v $1 > /dev/null
+}
+
 if [ "$UID" -eq "$ROOT_UID" ]; then
 
   # Copy Vimix
@@ -12,14 +17,16 @@ if [ "$UID" -eq "$ROOT_UID" ]; then
   echo "GRUB_THEME=\"/boot/grub/themes/Vimix/theme.txt\"" >> /etc/default/grub
 
   # update grub
-  update-grub
+  if has_command update-grub; then
+    update-grub
+  elif has_command grub-mkconfig; then
+    grub-mkconfig -o /boot/grub/grub.cfg
+  fi
 
-  echo -e "/n All done!"
-  notify-send "All done!" -i face-smile
+  echo -e "\n All done!"
 
 else
-  echo -e "/n Please run this script by root..."
-  notify-send "Please run this script by root..." -i notification
+  echo -e "\n Please run this script by root..."
 fi