To reset MySql root password on Ubuntu, you can use following commands.

1. Stop MySql Service on server

sudo /etc/init.d/mysql stop

2. Now configure mysqld

sudo mysqld –skip-grant-tables &

3. Login into MySql as root

mysql -u root mysql

4. Reset old password with new

UPDATE user SET Password=PASSWORD(‘NewPassword’) WHERE User=’root’; FLUSH PRIVILEGES; exit;

Note :: Replace NewPassword with required mysql root password.