Steps to reset mysql password

reset_mysql_password.sh

sudo /etc/init.d/mysql stop

sudo mkdir -p /var/run/mysqld
sudo chown mysql:mysql /var/run/mysqld

cat << EOF > reset.sql
use mysql;
update user set authentication_string=password('') where user='root';
rupdate user set plugin="mysql_native_password" where User='root';
flush privileges;
quit;
EOF

sudo mysqld_safe --skip-grant-tables &
sudo mysql -u root << reset.sql

rm reset.sql

sudo /etc/init.d/mysql stop
sudo /etc/init.d/mysql start