I am reinstalling piwik and i meet a problem that cannot continue after "Databse Setup" section. And it always turning back to the "welcome" page. The version i am installing is 2.8.1
And also i find the follow error from log:
[Wed Oct 15 20:25:22 2014] [error] [client 220.127.116.11] PHP Fatal error: Call to private method Piwik\Plugins\Installation\Controller::hasEnoughTablesToReuseDb() from context '' in /var/www/lvunie/public_html/piwik/plugins/Installation/Controller.php on line 202, referer: http://lvunie.wpic-demo.com/piwik/index.php?action=databaseSetup&module=Installation
What PHP version are you using? I think this is a bug in your PHP version. Could you try upgrade to more recent PHP?