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I'm using Ubuntu 11.10. After I login in any tty1-6 it show the message "Module unknown" and log me out automatically.

But in the graphical session I am logged in correctly. How to solve the problem?

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closed as too localized by Luis Apr 1 '13 at 0:49

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Looks like this has to do with PAM (Pluggable Authentication Modules). You should look into /etc/pam.conf and /etc/pam.d/login and check whether all the modules (pam_*.so) are available on your system. –  daniel kullmann Jan 4 '12 at 6:24
    
Thanks for the answer. I got solved this problem. –  gobinkl Jan 10 '12 at 2:48
    
You should consider answering your own question, then, if you think the answer might be of interest to others as well. –  daniel kullmann Jan 10 '12 at 7:14