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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??

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If you're SURE that you remember the correct password, it's an issue with 'PAM'. Check this link:

And, edit those files using a Ubuntu LiveCD. Set a root password on the disk after you log-in using:

$ sudo passwd root

Be advised that the password change is lost the next time you use the CD.

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