Tuesday, April 24, 2012

How to restore / reinstall grub

If you install another operating system and by mistake you messed up, and you now feel that restoring the grub is a good option OR you install some thing, and found some operating system missing on system boot, then here are the steps to restore the grub:

Step 1: open a terminal, and gain root access, you can also use "sudo"

Step 2: run $os-probe
this will give you all the operating system present on your machine.

Step 3: $grub2-mkconfig -o /boot/grubX/grub.cfg
replace X with the version of grub you are having , in some cases it is grub and grub2 depending upon the different operating system you installed

Step 4: $grub2-install /dev/sda
this will install grub in MBR (Master Boot Record)

Use the above commands at your own risk, they always works for me. (triple boot: fedora 17B, Debby Sqeeze, and Windows 7)

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