I had something like this happen to me a few years ago, though
obviously it was not with current distros. As I remember, I booted
from a Fedora live CD and one of the options was to re-do the MBR. I
did, and it worked fine.
See:
https://docs.fedoraproject.org/en-US/Fedora/16/html/Installation_Guide/ap-rescuemode.html
and
https://ask.fedoraproject.org/question/31318/recovering-fedora-19-boot-reinstalling-grub/
Look at section 19.1.2.1 - Reinstalling the boot loader.
Frankly, if it wuz me, I'd just choose one or the other and run
everything else as a virtual machine (I use virtualbox).
billo
Note by the way that this will make Fedora your default boot, and if
your Ubuntu partition is screwed up enough, it may not recognize it as
such, which means you'll have to play Ubuntu games to fix it.
billo
I thought about virtual partitions but if the primary linux stuffs up,
everything is lost, If I were going this path I would use CentOS as the
primary.
I wanted ubuntu and fedora to be quite separate but did not realise
that upgrading ubuntu from 12.10 to 130.4 would trash the grub that I
was using.
Roger
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