Mojave update stuck: administrator is creating non-ejectable disk image

While updating macOS Mojave 10.14.6 with the security and supplemental updates iMac restarted and got stuck at about 15% progress. Even after waiting for 3hrs when progress bar didn’t move I restarted the mac by holding the power button. It again reached at the same spot of 15% progress bar and it was not moving at all.

This time I restarted and I was holding the shift key. It didn’t go to safe mode.

Again restarted and pressed “COMMAND + V” for verbose mode startup. It started showing everything on terminal. This is where I found it got stuck with the message for very long time

administrator is creating non-ejectable disk image

Finally I could fix it with these steps

  1. Hold Command + R on startup of macOS
  2. Select the first option, Restore from Time Machine Backup
  3. Before starting the update, macOS must have saved one snapshot. Choose that snapshot with date/time.
  4. Accept that as restore point & restart the Mac

It will restart the Mac & now everything works fine.

These steps actually undo the process of update. Now I can choose updates one by one instead of bulk installing so many updates.

Note: While it was taking hours to apply the update I started drawing above the Mac Monitor. Marking if progress bar is moving very slow. And frustration marks above the Apple, because it was taking really very very long time.

About Deepak Keswani 99 Articles
Developing Applications for Computers since 1995 :)


  1. This was extremely helpful, as I was in a situation much like you outlined. Thanks so much for this post.

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