sudo mysql_upgrade -u root -p to verify it is updated. It will install the repositories for future dist-upgrades.
/etc/mysql/mariadb.conf.d/50-server.cnf
[mysqld]
general_log_file = /var/log/mysql/mysql.log
log_error = /var/log/mysql/error.log
log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M binlog_format = mixed
expire_logs_days = 10
tmp_table_size=64M
max_heap_table_size=64M
query_cache_size=64M
[mariadb]
plugin_load_add = feedback
feedback=on
innodb_temp_data_file_path=ibtmp1:32M;ibtmp2:32M:autoextend