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Possible Duplicate:
How do I reset a lost Administrative(root) password?

My question has been previously asked by other users, but has been dismissed by those who answered. I changed the password to blank, but ubuntu still keeps on asking me for authentication every time I open a program and both blank and my old password do not work. I am certain I do remember my old password. I tried changing it in grub but when I go to the console in root and type passwd [my account name] then asks me to type and retype my new password the console does not react to my typing. When I still type my password, assuming it simply just does not show it but it receives it I get an error: token malfunction, password unchanged. Please help, I need my computer for work.

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marked as duplicate by Bruno Pereira, Jorge Castro, htorque, Takkat, James Jan 5 '12 at 20:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

You cannot use blank passwords for administrative accounts, you need to reset your password now else you are locked in your system. – Bruno Pereira Dec 26 '11 at 0:15
Use the guide on the link above to reset your password. – Bruno Pereira Dec 26 '11 at 0:15

Don't set the password to blank. Delete it. Do the following as root user.

passwd -d

From the manual

   -d, --delete
       Delete a users password (make it empty). This is a quick way to
       disable a password for an account. It will set the named account
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