Here’s a quick how-to for restoring your grub bootloader when you load a new OS (like Windows) and it overwrites your grub bootloader. Hopefully you can follow this guide and have luck. Unfortunately, that did not work for me. I was running Kubuntu 11.10 Alpha 3 and only had the CD for 10.10 and the steps didn’t work. What I did to get it to work was:

• Boot off of older 10.10 LiveCD
• Open Terminal and type the following to get your partition map list


# sudo fdisk -l


• Find your Linux partition (in my case it was /dev/sdb5)
• Mount that partition


# sudo mkdir /mnt/linux
# sudo mount /dev/sdb5 /mnt/linux


• Bind mount your /dev folder


# sudo mount --bind /dev /mnt/linux/dev


• Change root to your Linux partition


# sudo chroot /mnt/linux


• Run grub-install on your boot drive


# sudo grub-install /dev/hdb


• Reboot and success