Thread:Project:Support desk/MediaWiki upgrade fails with Database error/reply

Hi!

The error "DatabaseBase::factory no viable database extension found for type 'mysql'" happens, because you have selected MySQL as database, but obviously MySQL is not available in your environment. This happens when PHP does not feature MySQL support. Make sure to activate MySQL support in PHP; I guess it is installing a PHP module (e.g. called "php5-mysql") and restarting the server or compiling PHP again with the module.