Thanks alot Fred for your help with this.
After running boot-repair from the usb stick, it seems to have worked.
When I rebooted, there was a menue with very small writing which had the choices between my current kernel, my current kernel recovery mode and previous kernels, it showed for around 10s and then the system continued to boot, do a VERY LONG filesystem check and then i was able to login.
I'm using the system now, and everything seems to be working ok.
I think the important message for me out of this whole thing is that I need to use boot-repair from a usb stick, so I'll be keeping my little friend handy in case another problem like this happens.
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