Modified for compatibility with Calamares 3.3.0 (changed userShell option)

lubuntu/modules/users.conf

@@ -17,4 +17,6 @@ passwordRequirements:
     maxLength: 0
 # Explicitly set the shell instead of deferring to Calamares. We have a platform
 # expectation derived from Ubuntu here.
-userShell: /bin/bash
+user:
+  shell: /bin/bash
+  forbidden_names: [ root ]