Im currently setting up two LEMP server's at home for use, mainly just to muck around with. I have set one up with simple machines forum and Mediawiki. However on the second server, when i tried to do it again. I keep getting the error, "Could not find a suitable database driver! You need to install a database driver for PHP. The following database types are supported: MySQL, PostgreSQL, Oracle, SQLite, IBM DB2. If you are on shared hosting, ask your hosting provider to install a suitable database driver. If you compiled PHP yourself, reconfigure it with a database client enabled, for example using ./configure --with-mysql. If you installed PHP from a Debian or Ubuntu package, then you also need install the php5-mysql module."
where from my knowledge i defiantely have mysql installed and php5-mysql.
Im installing mediawiki 1.19.2 I am running it off Ubuntu Server 12.04 LTS (virtual Machine) I'm using a mysql 5.5.24 (for ubuntu)