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When trying to add a new user on a Debian 6.0 box I get:

passwd: User not known to the underlying authentication module

How can I disable Kerberos authentication and use the good old UNIX password?

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How was it initially set up? Sounds like your PAM configuration is looking in the wrong place. – Bart Silverstrim Mar 15 '11 at 13:00
Yes PAM seems to be messed up, this is a VPS server. I upgraded it with apt from lenny to squeeze I think that maybe screwed something. Not sure how to disable/remove PAM or fix it. I have never touched PAM before so it got the default settings. – breez Mar 15 '11 at 13:36

you just have to: aptitude purge libpam-krb5 this package seems to be automatically installed while upgrading and after that it thinks you're running kerberos authentication... at least on my VPS.

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Did the trick for me, thanks. – MBober Mar 24 '12 at 10:03
Upgraded from Debian 5 to 6 and had this issue. – deed02392 Jan 4 '13 at 19:06

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