mac os high sierra unable to unmount volume for repair

#Mac os high sierra unable to unmount volume for repair pro

I tried disabling time machine, running disk recovery, re-installing Sierra through recovery mode (failed / file unavailable), re-installing High Sierra via recovery mode (installer failed), installing Sierra via a USB drive (hold down option, select USB drive with image on it), and probably something else I'm forgetting to mention.

Open Diskutil and reformat the drive to APFS ****Note that you will lose any data stored on the drive**** Open Terminal and force unmount the driveģ. Boot into internet recovery mode Option-Command-RĢ. Sep 27 15:32:48 Hostname OSInstaller: Clearing automation and attempting to rebless. Sep 27 15:32:48 Hostname OSInstaller: Disk repair retry failed too many times. Sep 27 15:32:48 Hostname OSInstaller: Restoring the original state found as mounted. Sep 27 15:32:48 Hostname OSInstaller: Volume could not be unmounted. Sep 27 15:32:48 Hostname diskmanagementd: diskmanagement: : mount failed: err=-69888 un0mt1=0 timeout=0 dissenter=1 dissenterpid=0 dissenterstatus=49168=0xc010 Sep 27 15:32:48 Hostname OSInstaller: Repairing file system. Sep 27 15:32:48 Hostname OSInstaller: Storage system check exit code is 0. Sep 27 15:32:48 Hostname diskmanagementd: diskmanagement: rawLaunch_block_invoke: waitpid(2) pid=586 ret/errno=586/35 status=0x00000000 exit=0

#Mac os high sierra unable to unmount volume for repair pro

I had no issues upgrading on my older iMac, 15-inch Macbook pro with touchbar, or VMs. I've also re-downloaded the installer several times. I've tried disk utility repairs both in Sierra, while in the High Sierra installer, and by booting into recovery mode. I have the exact same issue with a late 2016 27-inch iMac with 1TB SSD.