How to make grub detect an old OS after formatting `/boot` partition

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http://askubuntu.com – I had set my PC like this: /boot - 250 MB ext3 / 80 GB ext4, Kubuntu Now I needed to install Ubuntu so I made a new 8 GB partition as / and formatted the previous /boot partition and set that same partition as new /boot for this new installation. The thing is that now my Kubuntu partition is like just a /home partition and a few other system folders but without a /boot and grub sees only the new Ubuntu installation. Please help, all my work for 1.5 years is on Kubuntu and I have to get it back. I could go and copy my firefox profile(cause this is the most important that I have there) bu (HowTos)