Two approaches to this. The first is to use the grub-install utility:
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grub-install --root-directory=/boot /dev/??? |
The second approach is to use the grub command line:
1. Start the grub command line:
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grub |
2. Determine the boot device:
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find /boot/grub/stage1 |
You’ll get something like “(hd0,0)”.
3. Tell grub where the root is:
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root (hd0,0) |
4. Install the MBR:
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setup (hd0,0) |