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For me I kept getting the following warning in verbose mode, boot would not progress past a certain point: Notice - new kext com.apple.driver.KextExcludeList, v15.0.3 matches prelinked kext but can't determine if executables are the same (no UUIDs). I'm running firevault which perhaps is a contributing factor. This fix worked for me: Boot into recovery mode (holding down command-R) and open a terminal from the appropriate menu Disable security mode with this command: csrutil disable Reboot again normally. With security mode disabled, the upgrade will (hopefully) be able to complete as more of the system is writeable. Boot into recovery mode again, and re-enable security mode: csrutil enable This is not a root cause fix, but it will work until your next upgrade.