Please include all of the lines below when reporting installation problems.
PHP 5.3.3-7+squeeze13 installed
Found database drivers for: MySQL
PHP server API is apache2handler; ok, using pretty URLs (index.php/Page_Title)
Have XML / Latin1-UTF-8 conversion support.
Session save path (/var/lib/php5) appears to be valid.
PHP's memory_limit is 20M.
Couldn't find Turck MMCache, eAccelerator, APC or XCache; cannot use these for object caching.
Found GNU diff3: /usr/bin/diff3.
Couldn't find GD library or ImageMagick; image thumbnailing disabled.
Installation directory: /var/www/mediawiki
Script URI path: /mediawiki
Installing MediaWiki with php file extensions
Environment checked. You can install MediaWiki.
Generating configuration file...
Warning: require_once(/var/lib/mediawiki/includes/DefaultSettings.php): failed to open stream: No such file or directory in /var/www/mediawiki/config/index.php(767) : eval()'d code on line 30 Fatal error: require_once(): Failed opening required '/var/lib/mediawiki/includes/DefaultSettings.php' (include_path='/var/lib/mediawiki:/var/lib/mediawiki/includes:/var/lib/mediawiki/languages:.:/usr/share/php:/usr/share/pear') in /var/www/mediawiki/config/index.php(767) : eval()'d code on line 30