安装MySQL-Server时如何防止MariaDB安装？

我正在尝试在Debian 9安装中安装MySQL Server，并且apt-get坚持通过以下方式安装此mariadb-client-10.1：

须藤apt-get install mysql-server mysql-client

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer     required:
  libmecab2 libtext-template-perl mecab-ipadic mecab-ipadic-utf8 mecab-utils
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
default-mysql-client default-mysql-server mariadb-client-10.1
mariadb-server-10.1
Suggested packages:
mailx mariadb-test netcat-openbsd tinyca
The following NEW packages will be installed:
default-mysql-client default-mysql-server mariadb-client-10.1
mariadb-server-10.1 mysql-client mysql-server
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 4,748 B/11.2 MB of archives.
After this operation, 125 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://ftp.jaist.ac.jp/debian stretch/main amd64 default-mysql-    client all 1.0.2 [3,050 B]
Get:2 http://ftp.jaist.ac.jp/debian stretch/main amd64 mysql-client amd64     5.5.9999+default [1,698 B]
Fetched 4,748 B in 0s (92.8 kB/s)
Preconfiguring packages ...
Selecting previously unselected package mariadb-client-10.1.
(Reading database ... 290851 files and directories currently installed.)
Preparing to unpack .../0-mariadb-client-10.1_10.1.26-0+deb9u1_amd64.deb ...
Unpacking mariadb-client-10.1 (10.1.26-0+deb9u1) ...
Selecting previously unselected package mariadb-server-10.1.
Preparing to unpack .../1-mariadb-server-10.1_10.1.26-0+deb9u1_amd64.deb ...
Unpacking mariadb-server-10.1 (10.1.26-0+deb9u1) ...
Selecting previously unselected package default-mysql-client.
Preparing to unpack .../2-default-mysql-client_1.0.2_all.deb ...
Unpacking default-mysql-client (1.0.2) ...
Selecting previously unselected package default-mysql-server.
Preparing to unpack .../3-default-mysql-server_1.0.2_all.deb ...
Unpacking default-mysql-server (1.0.2) ...
Selecting previously unselected package mysql-client.
Preparing to unpack .../4-mysql-client_5.5.9999+default_amd64.deb ...
Unpacking mysql-client (5.5.9999+default) ...
Selecting previously unselected package mysql-server.
Preparing to unpack .../5-mysql-server_5.5.9999+default_amd64.deb ...
Unpacking mysql-server (5.5.9999+default) ...
Setting up mariadb-client-10.1 (10.1.26-0+deb9u1) ...
Processing triggers for menu (2.1.47+b1) ...
Processing triggers for systemd (232-25+deb9u4) ...
Processing triggers for man-db (2.7.6.1-2) ...
Setting up mariadb-server-10.1 (10.1.26-0+deb9u1) ...
Setting up default-mysql-client (1.0.2) ...
Setting up default-mysql-server (1.0.2) ...
Setting up mysql-server (5.5.9999+default) ...
Setting up mysql-client (5.5.9999+default) ...
Processing triggers for systemd (232-25+deb9u4) ...

有什么办法只能安装MySQL服务器吗？还是必须安装MariaDB东西？提前致谢。