当我尝试时，sudo apt-get install mysql-server我不断收到以下错误：
The following packages have unmet dependencies:
mysql-server : Depends: mysql-community-server (= 5.7.12-1ubuntu15.10) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
并且不知道如何处理它
当我尝试安装 mysql-community-server 时，我得到：
The following packages have unmet dependencies:
mysql-community-server : Depends: mysql-client (= 5.7.12-1ubuntu15.10) but it is not going to be installed
Depends: libmecab2v5 (>= 0.996-1.1ubuntu1)
E: Unable to correct problems, you have held broken packages.
然后在安装 mysql-client 时：
Reading package lists... …