I had the same problem on Kubuntu alt amd64 w/ nVidia 8600.  But I was
able to fix it.  It seems the vesafb module is needed--but it is
blacklisted.  Here's what I did:

add "vesafb" to /etc/initramfs-tools/modules
comment out "blacklist vesafb" in  /etc/modprobe.d/blacklist-framebuffer
generate modules.dep: sudo depmod -a
try loading it: sudo modprobe vesafb
sudo update-initramfs -u
reboot

These instructions are based on
http://ubuntuforums.org/showthread.php?t=622018  however he was also
trying to set up fbcon which I don't think is need to fix the problem.
In my case I used hwinfo --framebuffer and edited /boot/grub/menu.lst to
run usplash at 1920x1200x24.  The posts above talk about these grub and
hwinfo, which is nice, but doesn't fix the problem.

PS: I'm guessing that vesafb was blacklisted for a reason, so this may
not work for everyone... if not you may need to remove splash from the
default options in /boot/grub/menu.lst... text boot messages are better
then a black screen.

Cheers,
~Thomas

-- 
Feisty crashes after grub, before boot process, if usplash is enabled (amd64)
https://bugs.launchpad.net/bugs/86666
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