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Sunday, December 6, 2009
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:
- 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:
- Install the GRUB MBR (assuming that
(hd0)is your boot drive and
(hd0,0)your boot partition):
- Reboot and have your boot menu back!