dpkg: warning: files list file for package `ramlog' missing, assuming package has no files currently installed.

dpkg: warning: files list file for package `libparted0' missing, assuming package has no files currently installed.
(Reading database ... 19248 files and directories currently installed.)
Preparing to replace dpkg 1.15.7.2 (using .../dpkg_1.15.8.13_powerpc.deb) ...
Unpacking replacement dpkg ...
dpkg: error processing /var/cache/apt/archives/dpkg_1.15.8.13_powerpc.deb (--unpack):
 trying to overwrite '/etc/logrotate.d/dpkg', which is also in package wd-nas 01.00.01-69399
Processing triggers for man-db ...
Errors were encountered while processing:
 /var/cache/apt/archives/dpkg_1.15.8.13_powerpc.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
MyBookLive:/var/cache/ddclient#