[clug] Repairing bootloader

[Boyd]

A quick search of the ubuntu forums has a few solutions.

As far as windows 7 goes, I haven't touched that yet, however I've fixed
vista and debian/ubuntu dual-boot installs before without problems.

The basic process is: you boot off the ubuntu CD and just reinstall grub to
/dev/sda (with specific command-lines found somewhere in the aforementioned
forums) and it should load GRUB first on boot, giving you the boot menu
showing the linux and windows boot options. If you choose windows, it then
loads the vista boot loader for you and everything that that contains. (some
people install vista and XP side by side, so this menu may contain vista as
well as xp as a windows OS choice).

There is also the sledgehammer solution, to just reinstall debian/ubuntu,
which then reinstalls grub at the end of the process, detecting any other
OS's, and everything usually works well once doing that.

YMMV.

On Thu, Sep 24, 2009 at 10:18 AM, BAXTER,Adam <adam.baxter at deewr.gov.au>wrote:

> Hi guys,
> I know I've left this til the last minute, but I'd like to have my
> dual-boot machine back up and running before the LUG so I can SSH into it
> for some troubleshooting by the gurus.
>
> I recently installed Windows 7 (yeah yeah, I know), and of course the
> installer clobbered GRUB. Is there an easy way to fix this from a
> LiveCD/USB? Every time I try I seem to destroy Windows' bootloader too.
>
> My setup is this:
> Sda1 is Windows
> Sda2 is Ubuntu
>
> I'm assuming the MBR is on /dev/sda, Windows bootloader (bootmgr/ntldr) is
> on /dev/sda1 and GRUB needs to be installed on /dev/sda.
>
> What's the best way to do this?
>
> --Adam
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