Any way to restore my original setup? Any idea why this happened?
If you want to go back to using Ubuntu's grub, you'll probably want to make sure you have the current grub installed on the LMDE partition (grub-install /dev/sdax -- using the pertinent partition number in place of x) and then when you're booted to Ubuntu run the grub-install /dev/sda (or sdb -- as the case may be), with no partition number. That will then install, or re-install Ubuntu's grub to the MBR of that drive.
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