sudo mysqld_safe --skip-grant-tables

sudo mysqld_safe --skip-grant-tables

sudo mysql --user=root mysql

mysql> update user set Password=PASSWORD('new-password') where user='root';
flush privileges;

mysql> update user set authentication_string=PASSWORD('new-password') where user='root';
flush privileges;

sudo service mysql stop

sudo service mysql start

$ sudo killall mysqld

sudo mysql_secure_installation

Set root password? [Y/n] y   (press 'y' to set new password)
New password:
Re-enter new password: