The installation of the beta and everything else went without problems, but there is a bug
Webmail has no Access to Database.
The Following Entry is in db.inc.php of Rouncube Webmail.
Quote$rcmail_config['db_dsnw'] = 'mysqli://roundcube_user:PASSWD@localhost/imscp';
But no Connection to Database can etablish.
I take a look at the Server and found that user "roundcube_user" will not exist in the system.
So i musst set it to
Quote$rcmail_config['db_dsnw'] = 'mysqli://root:MYSQLROOTPW@localhost/imscp';
Then it works.