Reinstall Grub after window install or other guest linux has taken over

I recently installed linux mint. It did not give me the option of installing grub or not and installed its own version / config into the mbr.

To get back to square one

Log into the Linux OS you want to have the grub mastered on and as root run grub-install /dev/sda (this might change depending upon the location of you MBR)

If you are reading this and stating; how can I do this if I can not log into my Linux OS; use a live disc, map / swap and as root run grub-install

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