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+====== Wordpress ======
+===== Wordpress permission fix =====
+When I upgrade the wordpress, it shows the error
+  This is usually due to inconsistent file permissions.: wp-admin/includes/update-core.php
+So I reset all the permission for the files:
+  cd /var/www/wordpress
+  sudo find . -type f -exec chmod 664 {} +
+  sudo find . -type d -exec chmod 775 {} +
+And try the upgrade again, it works.