[Err] 1045 - Access denied for user ‘root‘@‘%‘ (using password: YES)

An error occurs when a user is granted permission

[Err] 1045 - Access denied for user 'root'@'%' (using password: YES)

terms of settlement ：

mysql> UPDATE mysql.user SET Grant_priv='Y', Super_priv='Y' WHERE User='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> quit
Bye
[[email protected] root]# systemctl restart mysql #  Remember to restart mysql service 

Then assign permission

CREATE USER 'newuser'@'%' IDENTIFIED BY '123456';
grant all privileges on *.* to 'newuser'@'%' ;