Cannot change ownership of the database directories to the 'xeffyr' user. Check that you have the necessary permissions and try again. If I run mysql_install_db without any arguments, the script is ...

the mysql database is not installed properly, so I cannot login with a user, nor with root. All my measures to get access, like: using mysql_install_db, mysql_upgrade starting mysql with ...

Unfortunately hosting services vary quite a lot in the way they work. Some will even install Moodle for you. Most will offer a web-based control panel to control your site, create databases and set up ...