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How do I fix MariaDB error?
Solution 1: Try to restart the MariaDB service and check whether it's working.

sudo systemctl start mariadb. Refresh the Koha page.
ls -a /var/run/mysqld.
sudo chown mysql:mysql /var/run/mysqld/
sudo systemctl restart mysql
sudo apt purge "mariadb*" -y
sudo apt-get install mariadb-server mariadb-client