[====>>https://www.cnblogs.com/leolztang/p/5094930.html

.sudo mysql -u root -p

.select user, plugin from mysql.user;

.update mysql.user set authentication_string=PASSWORD('newPwd'), plugin='mysql_native_password' where user='root';

.flush privileges;

.exit

a. sudo apt-get autoremove --purge mysql-server-5.0

b. sudo apt-get remove mysql-server

c. sudo apt-get autoremove mysql-server

d. sudo apt-get remove mysql-common (非常重要)

dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

a. sudo apt-get install mysql-server

b. sudo apt-get install mysql-client

c. sudo apt-get install php5-mysql(安装php5-mysql是将php和mysql连接起来 )

sudo netstat -tap | grep mysql

root@ubuntu:~# sudo netstat -tap | grep mysql

tcp   localhost.localdo:mysql *:* LISTEN

/mysqld

sudo /etc/init.d/mysql restart

sudo mysql