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I want to add a new user to my linux system. A problem happened when i issued "passwd username" to set a password for the user.
The error message says "passwd: user not known to the underlying authentication module".
Check that the user exists in /etc/passwd, just to be sure, but otherwise it seems like a PAM configuration error. You could look at the appropriate files under /etc (usually pam.conf and/or files in the pam.d directory)