Thread:Project:Support desk/Install error Warning: preg replace() function.preg-replace : Compilation failed: this version of PCRE is not compiled with PCRE UTF8 support at offset 0 in /var2/mediawiki-1.16.0/includes/Title.php on line 2285/reply

The problem is exactly what it says: your PHP is misconfigured. We'll see to add a check for this condition in installer.