trouble with custom kernel

[Bernd Prager <bernd@prager.ws>]

Hi,

I have been building custom kernels for my system a while now.
Recently I run into trouble that I haven't experienced before:

I build my kernel with:
$ make menuconfig
$ make-kpkg clean
$ fakeroot make-kpkg --initrd --append-to-version=-custom kernel_image 
kernel_headers

When I try to install I get now following error:
$ dpkg -i linux-image-2.6.30-custom_2.6.30-custom-10.00.Custom_amd64.deb
(Reading database ... 136073 files and directories currently installed.)
Unpacking linux-image-2.6.30-custom (from 
linux-image-2.6.30-custom_2.6.30-custom-10.00.Custom_amd64.deb) ...
Done.
dpkg: error processing 
linux-image-2.6.30-custom_2.6.30-custom-10.00.Custom_amd64.deb (--install):
trying to overwrite `/lib/firmware/mts_edge.fw', which is also in 
package linux-image-2.6.29.1-custom
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Running postrm hook script /sbin/update-grub.
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-2.6.29.1-custom
Found kernel: /boot/vmlinuz-2.6.27-14-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done

Errors were encountered while processing:
linux-image-2.6.30-custom_2.6.30-custom-10.00.Custom_amd64.deb

Any suggestion what to do?

Thanks you,
-- Bernd