Enter password: ****

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mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

Query OK, 0 rows affected (0.08 sec)

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

Query OK, 0 rows affected (0.02 sec)

 mysql> FLUSH PRIVILEGES;

 Query OK,  rows affected (0.01 sec)