A MongoDB database is automatically installed by the antidot-fluidtopics-standalone metapackage to store user-related content.
Make sure that the database is running by checking its status by running the following command:
As root user
systemctl status mongod
If the database does not respond, start MongoDB by running the following command:
As root user
systemctl start mongod
As MongoDB is installed by the antidot-fluidtopics-standalone metapackage, if it is not running, you should consult your Antidot contact.