Can't correct broken dependencies on WD MyBook Live?

[galahad@ftp83plus.net]

 Hi there, 

I've got a WD MyBook Live on which I want to compile no-ip DUC client. However, it seems unable to complete some dependencies during installation of compilation tools for a reason I have yet to understand, as my experience with Linux is mostly GUI-based. I would like it to feature an automated client for periodically updating its external IP, and a way to open ports using UPnP in the router, as supported (I don't know the package name yet).

Here is the terminal output:

        # apt-get upgrade
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    You might want to run `apt-get -f install' to correct these.
    The following packages have unmet dependencies:
      apt-utils: Depends: libapt-pkg4.10
      libept1: Depends: libapt-pkg4.10
    E: Unmet dependencies. Try using -f.

Then, following instructions:

    # apt-get -f install
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    Correcting dependencies... Done
    The following extra packages will be installed:
      apt aptitude
    Suggested packages:
      dpkg-dev apt-doc python-apt debtags
    Recommended packages:
      aptitude-doc-en aptitude-doc apt-xapian-index libparse-debianchangelog-perl
    The following packages will be REMOVED:
      libept0
    The following packages will be upgraded:
      apt aptitude
    2 upgraded, 0 newly installed, 1 to remove and 243 not upgraded.
    2 not fully installed or removed.
    Need to get 0B/6081kB of archives.
    After this operation, 2597kB of additional disk space will be used.
    Do you want to continue [Y/n]? Y
    apt-extracttemplates: error while loading shared libraries: libapt-pkg.so.4.10: cannot open shared object file: No such file or directory
    debconf: apt-extracttemplates failed: Bad file descriptor
    (Reading database ... 
    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 ... 19468 files and directories currently installed.)
    Preparing to replace aptitude 0.4.11.11-1~lenny1 (using .../aptitude_0.6.3-3.2+squeeze1_powerpc.deb) ...
    Unpacking replacement aptitude ...
    dpkg: error processing /var/cache/apt/archives/aptitude_0.6.3-3.2+squeeze1_powerpc.deb (--unpack):
     trying to overwrite '/etc/logrotate.d/aptitude', which is also in package wd-nas 02.50.00-119234
    Processing triggers for man-db ...
    Errors were encountered while processing:
     /var/cache/apt/archives/aptitude_0.6.3-3.2+squeeze1_powerpc.deb
    E: Sub-process /usr/bin/dpkg returned an error code (1)
    MyBookLive:~# 



I am not exactly sure why this fails.

Ideas?