[sudo-users] With-Pam and Failures on Console

[Todd C. Miller]

I don't know why PAM would be behaving differently on the console
compared to a pseudo tty (telnet, ssh, etc) unless the console
special-cased in the PAM config.  It is also possible that the tty
special characters are set differently on the console.  You might
compare the output of "stty -a" on both and look for characters.

 - todd