I then created a High Sierra installer on an SD card, and booted from it (held Option while booting). I still couldn't install High Sierra (same error). I ran "diskutil unmount force" on the partition, then I was able to run Disk Utility's "First Aid". This is from the Recovery partition, so I'm not actively booted from "Macintosh HD". If I bring up a terminal, then "diskutil unmount" the drive, it says "Volume Macintosh HD on diskX failed to unmount: dissented by PID=0 (kernel)". If I boot into Recovery, then run disk utility, I get a similar error. When I run the installer, it reboots, starts to install, then says "Unable to unmount volume for repair". I've spent the past few hours trying to get it to install onto my Mac Mini (Late 2014). I've successfully installed the High Sierra GM candidate on my MacBook Pro.
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