failure of authentication for Qpopper

[peasthope@shaw.ca]

Another problem since the update of Squeeze yesterday.

Qpopper was removed and I reinstalled it. 
As for the original installation, I left  
qpopper.conf as installed.

When the mailer attempts retrieval from qpopper 
this message appears.
RCV: -ERR [AUTH] PAM authentication failed for user "peter": Module is unknown (28)

The PAM library packages appear as installed 
previously.  The PAM modules should be available.

/var/log/ syslog has these lines.
Feb  7 16:08:13 joule in.qpopper[2825]: connect from 172.23.5.2 (172.23.5.2)
Feb  7 16:08:13 joule in.qpopper[2825]: (v4.0.9) Servicing request from "heaviside.invalid" at 172.23.5.2 [pop_init.c:1408]
Feb  7 16:08:23 joule in.qpopper[2825]: peter at heaviside.invalid (172.23.5.2): -ERR [AUTH] PAM authentication failed for user "peter": Module is unknown (28) [pop_pass.c:532]
Feb  7 16:08:23 joule in.qpopper[2825]: [AUTH] Failed attempted login to peter from host (heaviside.invalid) 172.23.5.2 [pop_pass.c:1265]

I've read /usr/share/doc/* and found nothing obviously 
relevant.

Any ideas about this?

Thanks,      ... Peter E.


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