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#220
Who told you that? It's patently not true. All you have to do is disable fast startup. Fast startup can't be used with dual-boot because fast-boot works by "hibernating" part of the OS kernel to the boot partition, when you boot the other OS, it sees this as incompatible and forces a check. Disabling fast boot solves the problem.
Has nothing to do with Secure boot. Nothing whatsoever. And you can completely use secure boot with other os's, even Linux supports secure boot.
Perhaps if you actually ASKED people about things, rather than jumping to conclusions about them, you wouldn't assume incorrect things.
Win 10 is no different from Windows 8 or 8.x in this regard. You still have to turn off fast boot if you want to dual boot.