Comment 11 for bug 292606

I'm having the same problem after compiling a custom kernel using kernel-package:

$ sudo make-kpkg --initrd --append-to-version=-nostradamus kernel_image kernel_headers

$ sudo dpkg -i linux-image-2.6.27.10-nostradamus_2.6.27.10-nostradamus-10.00.Custom_amd64.deb

Selecting previously deselected package linux-image-2.6.27.10-nostradamus.
(Reading database ... 147895 files and directories currently installed.)
Unpacking linux-image-2.6.27.10-nostradamus (from linux-image-2.6.27.10-nostradamus_2.6.27.10-nostradamus-10.00.Custom_amd64.deb) ...
Done.
Setting up linux-image-2.6.27.10-nostradamus (2.6.27.10-nostradamus-10.00.Custom) ...
Running depmod.
Finding valid ramdisk creators.
Using mkinitramfs-kpkg to build the ramdisk.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms
run-parts: executing /etc/kernel/postinst.d/nvidia-common
run-parts: /etc/kernel/postinst.d/nvidia-common exited with return code 20
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-2.6.27.10-nostradamus.postinst line 1181.
dpkg: error processing linux-image-2.6.27.10-nostradamus (--install):
 subprocess post-installation script returned error exit status 2
Errors were encountered while processing:
 linux-image-2.6.27.10-nostradamus