sudo mysql ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root'; code example

Example 1: mysql change root mysql_native_password

UPDATE
	mysql.user
SET
	plugin = 'mysql_native_password', 
	Password = PASSWORD('')
WHERE
	User = 'root';

Example 2: how to login to mysql as normal user in ubuntu

CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';

GRANT ALL PRIVILEGES ON database_name.* TO 'newuser'@'localhost';