mariaDB

$ sudo apt-get install mariadb-server

$ sudo mysql -u root -p  
Enter password:

MariaDB [(none)]> USE mysql;

MariaDB[(none)]> show database;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+

動作確認用で"testdb"という名前のデータベースを追加します。
MariaDB [(none)]> CREATE SCHEMA testdb DEFAULT CHARACTER SET utf8mb4;
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| testdb             |  <--追加された
+--------------------+