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Fixing Ubuntu install from 10.04 -> 10.10 -> 11.0

If faced with a grub prompt, I did these commands to fix it:

set root=(hd0,1)
linux /vmlinuz root=/dev/sda1 ro
initrd /initrd.img

after reboot:

sudo grub-install /dev/sda
sudo update-grub

Found in a comment here:

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