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stuck on grub command prompt, dual boot windows/ubuntu

Asked by Ben Seiker

Hello,

I have dual booted Ubuntu and Windows 7 on my laptop. After an update on 10.04LTS, ubuntu boot screen faded out to a white screen, and after a reboot wouldn't even give the option to boot ubuntu, just booted straight to windows.

after some research, I tried following instructions on ubuntuforums to copy grub2 files from a live cd. However, now my laptop won't even boot windows, it just goes straight to the grub command prompt.

Need help ASAP!

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Cyprian Guerra (cyprian-guerra) said : 		#1

1. Well, first of all you have to set the root of your file system (partition on which vmlinuz file is located). Put in grub prompt:
        grub> root (hd0,
(press tab twice to see the list of available partitions and choose one)
        grub> root (hd0,2)
(equals to /dev/hda3)

2. Then you need to set which kernel to use:
        grub> kernel /boot/
(press tab twice and choose a kernel, there should be vmlinuz - if there isn't try different partition in step 1)
        grub> kernel /boot/vmlinuz root=/dev/hda3

3. Set initrd in the same manner:
        grub> initrd /boot/initrd

4. Then boot it:
        grub> boot

That's it. After this just rescue your system so it would boot properly the next time you restart or you're back in square one.

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