Cannot login into console due to authentication failure

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http://askubuntu.com – After a succesvol upgrade from ubuntu 10.04 i can login with ssh. But login from the console failed? get failure message "login incorrect". /var/log/auth.log says: login[7879]: pam_unix(login:auth): authentication failure; logname=LOGIN uid=0 euid=0 tty=/dev/tty2 ruser= rhost= user=USER001 login[7879]: FAILED LOGIN (1) on '/dev/tty2' FOR 'USER001', Authentication failure who can help me? (HowTos)