解决安装MySQL 5.6 启动mysql提示 ERROR 1045 (28000): Access denied for user root@ localhost的异常

在UBUNTU16.04上安装mysql5.6后，启动mysql,

错误提示：　ERROR 1045 (28000): Access denied for user root@ localhost

这里需要重新配置数据库密钥，流程如下：

1.　sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

2.　在该配置文件最后一行插入：skip-grant-tables

3.　重启mysql服务sudo service mysql restart

4.　启动mysql修改root用户密钥，具体操作如下：

$ mysql
mysql> use mysql
mysql> update mysql.user set authentication_string=password('qwer1111') where user='root' and Host ='localhost';
mysql> update user set plugin="mysql_native_password";
mysql> flush privileges;
mysql> quit;
Bye

5. 　回到/etc/mysql/mysql.conf.d/mysqld.cnf，把“skip-grant-tables”注释掉

6.　重启mysql服务sudo service mysql restart

7.　执行＂mysql -u root -p＂，输入密码后登录成功