I was working with mysql and something wrong happen do not know what is that but i was not able to login to my database either by phpmyadmin or but using my terminal i got scare may be i lost lot of thing but i found a lot of way to fix the issue and here is the solution
Set / change / reset the MySQL root password on Ubuntu Linux. Enter the following lines in your terminal.
Stop the MySQL Server.
sudo /etc/init.d/mysql stop
Start the mysqld configuration.
sudo mysqld –skip-grant-tables &
Login to MySQL as root.
mysql -u root mysql
Replace YOURNEWPASSWORD with your new password!
UPDATE user SET Password=PASSWORD(‘YOURNEWPASSWORD’) WHERE User=’root’; FLUSH PRIVILEGES; exit;
Note: This method is not regarded as the securest way of resetting the password. However it works.