Installation issue solved..

resources/views/layouts/install.blade.php

@@ -23,7 +23,6 @@
                         <div class="card">
                             {!! Form::open([
                                 'url' => url()->current(),
-                                '@submit.prevent' => 'onSubmit',
                                 'role' => 'form',
                                 'id' => 'form-install'
                             ]) !!}

resources/views/partials/install/head.blade.php

@@ -33,13 +33,13 @@
 
         @stack('js')
 
-        <script>
+        <script type="text/javascript"><!--
             window.Laravel = <?php echo json_encode([
                 'csrfToken' => csrf_token(),
             ]); ?>
 
             var flash_notification = {!! (session()->has('flash_notification')) ? json_encode(session()->get('flash_notification')) : 'false' !!};
-        </script>
+        //--></script>
         {{ session()->forget('flash_notification') }}
 
         @stack('scripts')