DCERouter's post install script changes some permission settings in mysql, and then stops and restarts it. I see in the log this:
Stopping MySQL database server: mysqld.
Starting MySQL database server: mysqld...failed.
Please take a look at the syslog.
Those messages come from mysql itself. Mysql is failing to start, and therefore nothing can continue. Please run: /etc/init.d/mysql restart
and tell me what you see. And if it fails, check the end of /var/log/syslog to see what mysql reported was the reason it could not start.