For some reason, I can't edit my post, so I'm quoting it.
I just wanted to add, I think it's pretty clear here that my issue is not a grub problem.
I imagine there is something in the mountall configs or something that I should be editing, but, of course, since everything it mounted read-only, I can't.
Trying to see if I can get in there using my 9.10 live-usb and edit stuff...
Of course, at this moment, I don't know what needs editing, yet, and, as mentioned, googling my specific error is not helping.
man mountall and mountall --help were completely useless, too.
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