Every link except home directes to 'Not found' page? I have created site directly on the shared host server by downloading fresh Drupal 8. Every think went Ok with installation and site installed properly. But whenever I click on any link of admin bar or my-accont/logout it directs me to Not Found page.

For example I clicked on Extend from admin menu and following message did appear.


  


Not found message


  


Any idea why this is happening and how to correct that. Very thanks.
You are missing (or having a malformed) htaccess file.

You can download a .htaccess file directly from drupal.org with the following link: https://raw.githubusercontent.com/drupal/drupal/8.2.x/.htaccess

If you want an htaccess file for a different disk version then you can change the version number in the above link.