I suspect (but don't know) based on some Googling is that it has something to do with the fact that my existing "Macintosh HD" volume is a "core storage local volume group". I've continued working on this, still no success. I've also tried "csrutil disable" to disable the System Integrety protection stuff. Why is the kernel mounting "Macintosh HD" (even when I'm booted from external media) and keeping it 'locked'? Is there any way to fix this? ", then immediately try "diskutil unmount" (without "force"), it fails with the same "dissented by PID=0 (kernel)" error. When it's mounted readonly, "diskutil unmount" (without force) works fine. ", then run the installer, it sees the disk - but fails (because it's readonly). If (while booted from the SD card) I bring up a terminal and "diskutil unmount force", the installer doesn't show "Macintosh HD" as an option (expected). Again, when installing macOS, I get the "Unable to unmount the volume for repair" error. I then created a High Sierra installer on an SD card, and booted from it (held Option while booting).
Mac couldn't unmount disk for repair install#
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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