Help - disaster recovery

[Phil]

My worst fears have been realised.

After running boot-repair I have one partition that looks like /, 
another partition of around 900 Mb that contains some system directories 
and a large unallocated block which I presume was my home directory.

Boot-repair gave me a URL to visit but it doesn't lead to anywhere.

So, what now?

By the way, the grub menu is back but that's cold comfort.

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Regards,
Phil