Matomo seems to work fine. Except that the widget titled “Visits Over Time” shows no data, but instead a red box with “Mysqli prepare error: Access denied for user ‘yvhu3nejs9HtWp4I’@‘localhost’ to database ‘pdrbshnqdqdwswtm’” (disregard the strange database names – they are auto-generated).
If I disable the goals plugin, everything seems to be fine.
I can log into mariadb from the terminal with the data provided in the config file.
I looked into the mariadb query log, but I cannot see a connection attempt that is different from the others.