Comment 8 for bug 290952

Well...
I'm really sure...
The problem was that in the menu.lst (of grub)...
It appear that lines with problem was:

title Ubuntu 8.10, kernel 2.6.27-7-generic
root (hd1,0)
kernel /boot/vmlinuz-2.6.27-7-generic root=UUID=3d06688c-29d9-4ceb-bc95-7a5a798294ba ro quiet splash
quiet

but /boot/initrd.img-2.6.24-21-generic was in de grub directory, so I just add
initrd /boot/initrd.img-2.6.24-21-generic
between splash and quiet to the menu.lst and it work find!!!

So, I don't know if it was the same problem...
(And upgrade was by gksu 'update-manager -d -c')
Now, it works find!
Think to all!!!
Pyov

@Jean-Baptiste Lallement
Super merci, vous êtes géniaux.