Last night I tried to install the GM candidate for High Sierra and ran into an error. I'd start the installer, my mac would reboot and appear to be installing. I'd get the screen saying 40 minutes left..... 39 minutes left....etc. Then after a couple minutes I'd get a screen with an error. It says
"macOS could not be installed on your computer The operation couldn't be completed. (com.apple.DiskManagement.disenter error -119930878). Quit the installer to restart your computer and try again."
If I try again, it does the same thing. I was able to boot holding option+command+r and reinstall Sierra. So I'm back to square where I was with no data loss, but I'm wondering if I try again what can I do differently? or should I just wait for this to be final.
~M