I have already found myself twice in the situation that after having to re-install Windows in a machine that had dual-boot with Ubuntu, the windows installer messes up with the MBR and it is not possible to access Ubuntu anymore.
As I always spend quite a lot of time remembering where I saw the easy solution, I decided to write it down myself in a place I would have always at hand.
The instructions should work in other linux flavors and specially in any Debian based distro.
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