Hi gissberg,
did you use the admin account and password of mysql while exporting the variables:
export KIXMYSQL_USER=<MySQL admin user> <- in most cases the user is "root"
export KIXMYSQL_PASSWORD=<MySQL admin password>
Could you please post the errors of kix_install.log (/opt/kix16/var/log/kix_install.log)?
Best regards,
Katja Hüsig