Help, I've tried upgrading to High Sierra from Sierra multiple times following the guide instructions, and each time the installing progress hangs on the first reboot, and after 10 minutes I've had to force shut down the computer, turn it on again, and boot into my macOS disk (which is still on Sierra, meaning the install didn't get written in). It always hangs on a screen like this; I'm not too concerned about the broken logo, since I see such a broken logo momentarily when I boot into my computer, but in any case the install is not writing itself in, and the computer hangs like this. I've tried upgrading without switching to AFS, but no luck either.