change gdm theme to gnome-shell

tasks/gnometweaks.yml

@@ -11,6 +11,12 @@
   command: localectl set-locale LANG="{{ config_system_locale }}" LANGUAGE="{{ config_system_locale }}"
   when: ansible_env.LANG != config_system_locale
 
+- name: Change GDM theme : from Ubuntu to Gnome shell
+  alternatives:
+    name: gnome-shell-theme
+    path: /usr/share/gnome-shell/gnome-shell-theme.gresource
+    priority: 50
+
 - name: Add user default profile to dconf
   template:
     src: user_profile_dconf