MacOS Installation Could Not Be Completed fix

A number of times recently MacOS updates have stopped me accessing my macbook.

The fix for this is as follows:

  • Click the restart button
  • As the machine restarts hold down the option key
  • When the boot options appear, choose your usual boot disc as opposed to the MacOS update.
  • Perform the update while you are present in front of the macbook as it fails if you let it try to auto-update.