Actually require to run with admin rights.

tools/aws-grub-setup.sh

@@ -19,10 +19,9 @@ done
 }
 
 # Check if user is root
-if [ $(id -u) = 0 ]; then
-   echo "Please don't run with root or sudo privileges!
-  > We'll request them when necessary."
-   exit 1
+if [ $UID != 0 ]; then
+    echo You need to run this script as root or sudo rights!
+    exit 1
 fi
 
 TMP_DIR="$(mktemp -d)"