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Yesterday I deactivated the Ubuntu 12.04 password because my parents come to my home and I need let they use the computer without password.

So, I go to System Settings" -> "User Accounts, unlocked the session and removed my password ("login without ask for password", something like this). But something is wrong, now I can start Ubuntu without type my password, but when I try to type something (in the first time of system initialization) system asks me for password to unlock keyboard.

When I type my password and press enter, system give to me an error message!! (incorrect password). I'm trying to follow this tuto, but I can't continue because my system says my password is wrong.

So, what can I do to solve this issue?

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