sudo apt-get install mysql

service mysql start

ps aug | grep mysql

mysql    24618  6.5  1.6 1230276 133536 ?      Ssl  19:03   0:00 /usr/sbin/mysqld

service mysql stop

sudo mysqld_safe --skip-grant-tables

mysql>
mysql> UPDATE mysql.user SET authentication_string = ''
    -> WHERE User = 'root' AND Host = 'localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

sudo kill -9 [pid_of_mysqld_safe]

service mysql start

mysql -u root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)