[Solved] Can't Disable Fast Start (Win10)

[AJGringo619]

(VirtualBox 5.2.26, Linux Mint 19.1 host, Windows 10 guest)

For the life of me, I cannot disable fast start. Every tutorial points me to the same thing - enabling hidden entries in the Power Management applet in Control Panel. On my system, none of these options show up. I have another Windows 10 install (not a VM) that was simple to do this on. What am I missing? I ran 'powercfg /H off', which seemed to disable hibernation, but fast start remains. I need to be able to access the .vdi file from Linux (using nbd), but can't because of the unstable filesystem in Windows. I also tried Winaero - same results.

EDIT: I tried to force hibernation on to see if the settings in Power Management would come back, and I got this:

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C:\Users\ajgri\Desktop>powercfg /hibernate on
Hibernation failed with the following error: The request is not supported.

The following items are preventing hibernation on this system.
        The system firmware does not support hibernation.

EDIT: another thing that makes no sense - this was working yesterday BEFORE I bought a Windows 10 license. Nothing has changed on the host or the vm. Here are the commands I'm using the mount the .vdi:

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# modprobe nbd; qemu-nbd --connect /dev/nbd0 '/home/me/Development/VM-testing/VirtualBox/(DEV) Windows 10/(DEV) Windows 10-fixed.vdi' ;fdisk -l /dev/nbd0; mount /dev/nbd0p2 /mnt
Disk /dev/nbd0: 100 GiB, 107374182400 bytes, 209715200 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc78928de

Device      Boot   Start       End   Sectors  Size Id Type
/dev/nbd0p1 *       2048   1126399   1124352  549M  7 HPFS/NTFS/exFAT
/dev/nbd0p2      1126400 209713151 208586752 99.5G  7 HPFS/NTFS/exFAT
The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Falling back to read-only mount because the NTFS partition is in an
unsafe state. Please resume and shutdown Windows fully (no hibernation
or fast restarting.)

Again, this was all working yesterday.

[AJGringo619]

OK, I've verified that fast start is disabled, but the problem remains. At this point I don't know if this is a Windows 10 problem, Linux problem, or VirtualBox problem. I do know that mounting .vdis this way works with Linux VMs.

[AJGringo619]

Hibernation/fast start had nothing to do with this problem. I had forgotten that I had taken a snapshot of the system; once I deleted it, everything works again.