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.