卸载残余

apt-get autoremove --purge mysql-server*
apt-get remove mysql-server
apt-get autoremove mysql-server
apt-get remove mysql-common

安装

apt-get install mysql-server
apt-get install mysql-client
apt-get install libmysqlclient-dev

修改用户的主目录

usermod -d /var/lib/mysql/ mysql

启动

service mysql start

停止

service mysql stop

重启

service mysql restart