mysql> grant all privileges on . to ‘root’@‘%’;

ERROR 1410 (42000): You are not allowed to create a user with GRANT

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> update user set host=‘%’ where user=‘root’;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> grant all privileges on . to ‘root’@‘%’;
Query OK, 0 rows affected (0.02 sec)

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

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

mysql> exit
Bye