ubuntu mysql Access denied for user root@localhost

解决办法：

1. vim mysqld.cnf  路径：/etc/mysql/mysql.conf.d

在[mysqld]下添加skip-grant-tables

2. 重启mysql服务

service mysql restart

3.连接mysql并设置密码

   mysql -u root

mysql>flush privileges

mysql> GRANT ALL PRIVILEGES ON *.* TO root@localhost IDENTIFIED BY "123456";

参考博客：https://blog.csdn.net/lisongjia123/article/details/57418989