ERROR 1396 (HY000): Operation ALTER USER failed for ‘root‘@‘localhost‘

mysql连数据库的时候报错:
1251 client does not support authentication protocol requested by server;consider upgrading Mysql client ERROR 1396 (HY000): Operation ALTER USER failed for ‘root’@'localhost’

先登录mysql

mysql -u root -p

输入密码

mysql> use mysql;
mysql> select user,host from user;

注意我的root，host是’%’
你可能执行的是:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

改成:

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'root';

操作记录：

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,host from user;
+------------------+-----------+
| user             | host      |
+------------------+-----------+
| root             | %         |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)

mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'root';
Query OK, 0 rows affected (0.00 sec)

mysql>