The macOS Mojave 10.14.6 Supplemental Update fixes an issue that may prevent certain Macs from waking from sleep properly.
YOU should wait to complete the process it happens to mine setup, while updating the MONITOR shut off for a while maybe 2 to 3 min. and I wait it don't touch anything let it complete the cicle and it should finish and no problem here.glad it worked for everyone else. It complete broke mine. Boot from install got to pink lines, tried to reboot, and never succeeded. Black screen. Tried 4 times, waiting several minutes on the black screen.
Tried rebooting by choosing previous regular mac boot - and got the same thing: black screen and no boot.
Looks like I’ll hve to reinstall from scratch .