High Sierra to Mojave upgrade: com.apple.DiskManagement error -69854.

Trees

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Dec 26, 2012
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Ran into this problem today. After clicking "Restart" to quit the installer and restart the computer, the 2014 Mac mini went into a restart loop, each time to a screen stating that the computer could not be started.

Restarted again into Recovery mode, and used the most current Time Machine backup image to do a restore. Took the backup right before downloading the Mojave installer and starting the upgrade.

Anyone else run into this specific error?
 
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JML5150

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No, I updated my 2014 Mini last week, no issues. But I have heard issues across Macs upgrading to Mojave. I glad you had a backup.
 

Not Quite Right

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May 11, 2013
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No problems here either, but I always start from scratch with a major OS updates by doing a clean install no mater what the device is. Been following that technique since the late 80's and a firm believer that's why I never experience a lot of issues others do with their tech ...
 

Trees

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Tried again with the Option + Command + R method, after running Disk Utility First Aid. Didn't see any issues found, but think it was good idea to check. This time the upgrade via the "Reinstall macOS" option worked well.
 

Spencerdl

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No problems here either, but I always start from scratch with a major OS updates by doing a clean install no mater what the device is. Been following that technique since the late 80's and a firm believer that's why I never experience a lot of issues others do with their tech ...

Exactly this.
 

kcox52692

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Ran into this problem today. After clicking "Restart" to quit the installer and restart the computer, the 2014 Mac mini went into a restart loop, each time to a screen stating that the computer could not be started.

Restarted again into Recovery mode, and used the most current Time Machine backup image to do a restore. Took the backup right before downloading the Mojave installer and starting the upgrade.

Anyone else run into this specific error?
No, I have a Late 2012 Mac Mini. I partitioned the drive and installed Mojave onto a separate partition just in case Mojave was buggy or things went south.
 

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