New Ubuntu 11.10 doesn't accept old password
I have just discovered that the new Unbuntu 11.10 doesn't accept the old password used for adding or removing apps. I am not able to use an application like Computer Janitor because the password used in the past is no longer accepted.
I would like to have no passwords at all and do not sign in with a password as that was neutralised earlier.
What do I do now to re-establish a password for applications?