Debian installer fails to install GRUB: solved

Executing 'grub-install dummy' failed

I recently installed the latest version of Debian on my laptop. I always do this when a new version comes out rather than upgrade, I prefer a fresh install which gives a sort of spring clean to my system. Unfortunately one of the final steps, installing the bootloader, failed. The error message was:

Unable to install GRUB in dummy. 
Executing 'grub-install dummy' failed. 
This is a fatal error.

You can’t exactly have a productive system if it won’t boot so how do we get around this little conundrum?

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