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

 进入Mysql；

mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
mysql -u root mysql

 在数据库中修改root的密码；

show databases;
use mysql;
UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
FLUSH PRIVILEGES;
quit