Ubuntu Natty: 32-bit userland, kernel de 64 bits?

Question

Estou tentando instalar manualmente um kernel de 64 bits para o Ubuntu de 32 bits. Eu tenho minhas razões para fazê-lo, mas elas são muito complicadas para explicar aqui. Antes de Natty, isso funcionou bem. Agora, no Natty, recebo a seguinte mensagem de erro quando tento fazer da mesma maneira:

dsimcha@dsimcha-laptop:~$ sudo dpkg -i --force-architecture linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb
[sudo] password for dsimcha:
dpkg: error processing linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb (--install):
cannot access archive: No such file or directory
Errors were encountered while processing:
linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb
dsimcha@dsimcha-laptop:~$ cd Downloads/
dsimcha@dsimcha-laptop:~/Downloads$ sudo dpkg -i --force-architecture linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb
dpkg: warning: overriding problem because --force enabled:
package architecture (amd64) does not match system (i386)
(Reading database ... 159153 files and directories currently installed.)
Preparing to replace linux-image-2.6.38-8-server:amd64 2.6.38-8.42 (using linux-image-2.6.38-8-server_2.6.38-8.42_amd64.deb) ...
Done.
Unpacking replacement linux-image-2.6.38-8-server:amd64 ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 2.6.38-8-server /boot/vmlinuz-2.6.38-8-server
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 2.6.38-8-server /boot/vmlinuz-2.6.38-8-server
dpkg: dependency problems prevent configuration of linux-image-2.6.38-8-server:amd64:
linux-image-2.6.38-8-server:amd64 depends on initramfs-tools (>= 0.36ubuntu6).
linux-image-2.6.38-8-server:amd64 depends on coreutils | fileutils (>= 4.0); however:
Package coreutils:amd64 is not installed.
linux-image-2.6.38-8-server:amd64 depends on module-init-tools (>= 3.3-pre11-4ubuntu3); however:
linux-image-2.6.38-8-server:amd64 depends on wireless-crda; however:
dpkg: error processing linux-image-2.6.38-8-server:amd64 (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
linux-image-2.6.38-8-server:amd64

Quando eu tento as dependências manualmente, eu obtenho, por exemplo:

dsimcha@dsimcha-laptop:~/Downloads$ sudo dpkg -i --force-architecture coreutils_8.5-1ubuntu6_amd64.deb
dpkg: warning: overriding problem because --force enabled:
package architecture (amd64) does not match system (i386)
dpkg: error processing coreutils_8.5-1ubuntu6_amd64.deb (--install):
coreutils:amd64 8.5-1ubuntu6 (Multi-Arch: no) is not co-installable with coreutils:i386 8.5-1ubuntu6 (Multi-Arch: no) which is currently installed
Errors were encountered while processing:
coreutils_8.5-1ubuntu6_amd64.deb

Alguém teve algum sucesso na instalação de kernels de 64 bits no Natty de 32 bits? Se sim, como isso pode ser feito?