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sudo apt-get install mysql-server mysql-client

cat /etc/mysql/debian.cnf 找到初始帐号密码

mysql -u username -p password 用初始帐号密码登陆mysql

1. use mysql;
2. update mysql.user set authentication_string=password('yourpassword') where user='root' and Host ='localhost';
3. update user set plugin="mysql_native_password";
4. flush privileges;
5. quit; 

sudo service mysql restart