Did you set the Windows partition to automount in `/etc/fstab` in Mint? That would make Mint think that that mount is part of the system, and since the system

Did you set the Windows partition to automount in `/etc/fstab` in Mint? That would make Mint think that that mount is part of the system, and since the system isn't entirely available, the boot cannot proceed. I suggest you add `nofail` to the mount options, and `nobootwait` on older that Ubuntu-16.04-derived Mint (doesn't run systemd) and `x-systemd.device-timeout=1` on Ubuntu-16.04+-derived Mint (should run systemd)