I ran the installer again - it only took a few minutes and again showed "success" and a restart prompt. I can tell the install did write to the external drive but I suppose it didn't finish.
In the Startup Disk pref pane, the external drive is selectable but it still shows as a Sierra boot. I went to the Startup Disk pref pane and made sure the external was selected and tried again. When I restarted, it booted from the internal drive instead.
It took about 25 minutes and gave a "success" message, prompting me to restart to finish. I downloaded the installer from the App Store and ran it to install on the external drive. The internal is a clone of the external just for backup, cloned via SuperDuper.Īccording to I can update directly to Mojave on this Mac Mini. The external drive has Sierra and this is what I always boot from. Mojave installation unbootable on external drive I have a Mac Mini (late 2014) with its stock internal drive and an external SSD via USB.
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