I never know what to do when this message pops up during a normal upgrade. Saying yes seems risky, so you typically would choose No so you could have time to research it and at least continue with the rest of the upgrade.
However when you do so, it will then lead you to another screen (I forgot to take a screenshot of that one) where it will say you should install on every partition regardless of the risk because it is recommended, which brings you BACK to this screen.
Eventually I chose YES and everything has turned out fine, except I’m stuck with the idea that if there is a reason Linux is not in the mainstream it is probably because of bewildering messages like these.
