sorry for probably this stupid topic, I'm an absoluty newbe. I have an apache2 server setup and running on a Debian Linux PC. I installed the PHP5 and the MySQL packages as described on
and they are confirmed to run as services (I did the "etc restart" test). I uploaded the WordPress 3.5.1. package under /var/www/wordpress/ via SFTP as root user. Generally I can access the files through the web interface e.g. readme.html.
Nevertheless the the /wordpress/wp-admin/install.php delivers only the message:
"Your PHP installation appears to be missing the MySQL extension which is required by WordPress."
Any advice is appreciated.