fopen when using apt-get

[Rob Hurle <rob1940@gmail.com>]

I regularly use:

apt-get update
apt-get upgrade

to keep my squeeze system up to date.  Updates install quite
satisfactorily, but invariably I get the following message as the
manual pages are being updated:

Unpacking replacement [whatever the package is] ...
Processing triggers for man-db ...
fopen: Permission denied
Setting up [whatever the package is] ([version information]) ...

This happens with all updates.  Anyone know what causes the error when
fopen is called, and is it serious?  Is it possibly something to do
with my man pages configuration?

Thanks for any help,
Rob Hurle
-- 
-----------------------------
Rob Hurle
ANU, College of Asia and the Pacific
School of Culture, History and Language
Histories of Asia and the Pacific
e-mail:              rob1940@gmail.com
Telephone (ANU): +61 2 6125 3169
Mobile (in VN):  +84 948 243 538
Mobile (in OZ):  +61 417 293 603
-----------------------------