How to solve “error: unknown filesystem. grub rescue>_”

Sometime ago I installed Ububtu on my brand new machine.

For some reasons I decided to remove Linux and install Windows 7. Everything worked fine until recently when my machine refused to boot showing the error message

This problem was caused because I didn’t removed Grub from MBR (Master Boot Record) and for some unknown reason it got lost.

The solution for this is quite simple.
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