If none of the other answers work for you, and you received this error:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

1 Stop Your Server First

$ sudo service mysql stop

2 Make MySQL service directory.

$ sudo mkdir /var/run/mysqld

3 Give MySQL permission to work with the created directory.

$ sudo chown mysql: /var/run/mysqld

4 Start MySQL, without permission and network checking.

$ sudo mysqld_safe --skip-grant-tables --skip-networking &

5 Log in to your server without any password.

$ mysql -u root mysql
or
$ sudo mysql -u root mysql

THANKS 😃