You can find mysql password here:/var/lib/zentyal/conf/zentyal-mysql.passwd
Thank you for the reply. As I wrote in the previous post, I know how to retrieve the mySQL password for the user zentyal. However, by logging into mySQL with such account I have not root privilege. How can I get it?
Moreover, I installed phpMyAdmin and during the installation it prompted me a choice for the Web server (apache or nginx) and for the mySQL password for phpmyadmin user. Then by using phpMyAdmin I'm able to log in only with zentyal and phpmyadmin account. No one has root access.