ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

I have been following a manual to install a software suite on Ubuntu. I have no knowledge of MySQL at all. I have done the following installations on my Ubuntu. ```lang-none sudo apt-get update sudo apt-get install mysql-server-5.5 sudo apt-get install mysql-client-5.5 sudo apt-get install mysql-common sudo apt-get install glade sudo apt-get install ntp ``` Then I do ```lang-none cd ~/Desktop/iPDC-v1.3.1/DBServer-1.1 mysql -uroot -proot <"Db.sql" ``` I ended up with the following error message. > ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) How may I fix it and continue?