The default portal root username is root. This account is used to configure the portal defaults and shared dashboards. There are times when a different username is appropriate for this account, such as when using LDAP authentication and the "root" username is restricted.
Change the super.user property in /usr/local/groundwork/config/gatein.properties to the new username by adding these lines to the end of that file:
# portal-configuration.xml setting for org.exoplatform.portal.config.UserACL
# super.user init parameter value. This setting and portal-configuration.xml
# synchronization is done on startup and when this file is modified. Once
# set, portal must be restarted for value to take effect.
super.user=<Insert new root user here>
Run this command to update the push the new setting into the portal:
java -cp /usr/local/groundwork/jpp/modules/com/groundwork/security/main/groundwork-jboss-security-7.2.0.jar com.groundwork.core.security.GateinConfigurationUtils \
-superuser <Insert new root user here>