stuck in apt loop with gnome-libs-data

[Adam Shand <larry@spack.org>]

hey.

since i upgraded libc6 and dpkg (from unstable) i've been having a lot of
problems with dpkg seg faulting trying to install stuff.  currently i
tried to upgrade gnumeric and it bombs out on gnome-libs-data like this:

(Reading database ... 44809 files and directories currently installed.)
Preparing to replace gnome-libs-data 1.2.8-helix1 (using .../gnome-libs-data_1.2.12-1_all.deb) ...
Unpacking replacement gnome-libs-data ...
dpkg: error processing /var/cache/apt/archives/gnome-libs-data_1.2.12-1_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_1.2.12-1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

the problem is that i can't upgrade anything else until this is fixed, and
i get this over and over again when i run "apt-get -f install" or try to
manually install the package with dpkg.

i've had problems like this before and normally moving the problem file to
/tmp and re-installing works (eg. mv /usr/share/idl/name-service.idl /tmp)
to get my by ... but this time it doesn't.

how do i get out of this?

adam.