Reinstalling GRUB with LVM from the Ubuntu cd

This post is mostly a reminder to myself. Every time I reinstall Windows, it overwrites my boot sector, and I need to reinstall it from the Ubuntu live CD to get my dual-boot system back. However, since my Ubuntu install is inside an LVM partition, this is not very straightforward. Here are the instructions. I kept them general so that they may be of use to someone else as well.

• Start from the Ubuntu CD and open a terminal.
• Install LVM:
  sudo apt-get install lvm2
• Find the name of the volume group:
  sudo vgdisplay
• Make the volume group available:
  sudo vgchange -ay name-of-vg
• Mount the root and boot file systems, and bind the dev file system:
  sudo mkdir foo
sudo mount /dev/name-of-vg/name-of-root-lv foo
sudo mount /dev/name-of-boot-partition foo/boot
sudo mount -obind /dev foo/dev
• Change to the root of your system:
  sudo chroot foo
• Drop into the GRUB prompt:
  sudo grub
• Install the GRUB MBR (assuming that (hd0) is your boot drive and (hd0,0) your boot partition):
  root (hd0,0)
setup (hd0)
• Reboot and have your boot menu back!