helix gnome vs sid (apt problem)

[<ocorrain@esatclear.ie>]

I seem to have screwed up my system by changing apt-lines from
helix-gnome to sid, and partially de-installing gnome. Now, whenever I
try to apt-get install anything, I get the following. Can anyone help?

aurelius:/home/ocorrain# apt-get install kppp
Reading Package Lists... Done
Building Dependency Tree... Done
You might want to run `apt-get -f install' to correct these:
Sorry, but the following packages have unmet dependencies:
  libgnome32: Depends: gnome-libs-data (>= 1.2.13-4) but
  1.2.11-ximian.1 is to be installed
  libgnomesupport0: Depends: gnome-libs-data (>= 1.2.13-4) but
  1.2.11-ximian.1 is to be installed
  libgnomeui32: Depends: gnome-libs-data (>= 1.2.13-4) but
  1.2.11-ximian.1 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or
specify a solution).

Trying... 

aurelius:/home/ocorrain# apt-get -f install
Reading Package Lists... Done
Building Dependency Tree... Done
Correcting dependencies... Done
The following extra packages will be installed:
  gnome-libs-data
1 packages upgraded, 0 newly installed, 0 to remove and 582 not
upgraded.
4 packages not fully installed or removed.
Need to get 0B/294kB of archives. After unpacking 511kB will be freed.
Do you want to continue? [Y/n]
(Reading database ... 94769 files and directories currently
installed.)
Preparing to replace gnome-libs-data 1.2.11-ximian.1 (using
.../gnome-libs-data_1.2.13-8_all.deb) ...
Unpacking replacement gnome-libs-data ...
dpkg: error processing
/var/cache/apt/archives/gnome-libs-data_1.2.13-8_all.deb (--unpack):
 trying to overwrite `/usr/share/idl/name-service.idl', which is also
 in package libgnorba27
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-libs-data_1.2.13-8_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Can anyone help?

Tiarnan