Comment 4 for bug 364029

I believe this is the problem:

Setting up linux-image-2.6.28-11-generic (2.6.28-11.42) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.28-11-generic
Not updating initrd symbolic links since we are being updated/reinstalled
(2.6.28-11.40 was configured last, according to dpkg)
[...]
Setting up linux-image-2.6.28-6-386 (2.6.28-6.20) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.28-6-386
Not updating initrd symbolic links since we are being updated/reinstalled
(2.6.28-6.17 was configured last, according to dpkg)
[...]
Setting up udev (141-1) ...
 * Stopping kernel event manager... 
[ OK ]
 * Starting kernel event manager... 
[ OK ]
Removing `local diversion of /sbin/udevadm to /sbin/udevadm.upgrade'
update-initramfs: deferring update (trigger activated)
[...]
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-2.6.28-6-386

udev was not yet configured when the initrd for the current kernel was generated; then udev was configured, triggering update-initramfs, but update-initramfs picks the wrong kernel to update (2.6.28-6-386 instead of 2.6.28-11-generic).