Comment 51 for bug 43572

Huygens, Bug #92194 describes the issue at hand. Basically the build machine probably didn't have libsmbios installed and thus did not the dell addon got built.
You can easily rebuild the module by first typing "apt-get source hal" in an empty directory. Enter the hal directory and issue sudo dpkg-buildpackage to properly build the hal .deb packages.
Make sure you have installed the libsmbios library first.
The last thing you need for success is to manually modprobe the dcdbas kernel module as it isn't autodetected.