Incorrect password at Cardamom Login for Ubuntu 10.04.4 LTS

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http://askubuntu.com – I installed Ubuntu 10.04.4 LTS on a single board computer (namely RoBOard) through a USB. After intallation and reboot, I got into the login page with the word "Cardamom under the Ubuntu logo. I remember the user name and password I set during installation, but those didn't work. It said Authentication Error and Incorrect Login. Does anyone know what the problem might be?? (HowTos)