删除mysql

sudo apt purge mysql-*
sudo rm -rf /etc/mysql/ /var/lib/mysql
sudo apt autoremove
sudo apt autoreclean(如果提示指令有误，就把reclean改成clean)

安装

sudo apt-get install mysql-server

    sudo apt install mysql-client
    sudo apt install libmysqlclient-dev

弄完一条再弄一条。如下所示：如入命令后再输入Y

设置你的密码

mysqladmin -u root password 你的密码
sudo /etc/init.d/mysql restart

配置文件
/etc/mysql/mysql.conf.d/mysqld.cnf