Same problem.
The issue is that the new kernel has a bad magic number. So it is unloadable.
But return to grub prompt instead of grub boot menu is very unpleasant.
The following sequence save me:
linux /boot/vmlinuz-2.6.31-14-generic root=/dev/sda1 loop=/ubuntu/disks/root.disk initrd /boot/initrd.img-2.6.31-14-generic boot
To fix the issue I have set GRUB_DEFAULT=2 in /etc/default/grub
Same problem.
The issue is that the new kernel has a bad magic number.
So it is unloadable.
But return to grub prompt instead of grub boot menu is very unpleasant.
The following sequence save me:
linux /boot/vmlinuz- 2.6.31- 14-generic root=/dev/sda1 loop=/ubuntu/ disks/root. disk img-2.6. 31-14-generic
initrd /boot/initrd.
boot
To fix the issue I have set GRUB_DEFAULT=2 in /etc/default/grub