When trying to upgrade WordPress to version 5.8 I encouraged a strange error: Update WordPress Downloading update from https://downloads.wordpress.org/release/wordpress-5.8-no-content.zip…The authenticity of wordpress-5.8-no-content.zip could not be verified as no signature was found.Unpacking the update…Could not copy file.: wordpress/wp-includes/css/dist/edit-post/style-rtl.cssInstallation failed. This looks at a first glance like a timeout or permission error. The signature error is actually …