Ubuntu :: Lost Password And Normal Methods Don't Work / Resolve This?

So I have forgotten my password, like a moron, and have been trying to reset/recover it.
I have found the plethora of sites giving instructions on how to reset my password, such as psychocats.net
So have gotten into the root shell and this is what I type.
ls /home
(gives me the name of my account)
passwd (my account here)
unknown user (account name here)

I have also tried doing the editing the boot kernel.
I add this: rw init=/bin/bash
Once I restart I get the root@(none) command prompt. Then I type passwd (username here) and get back ' unknown user