Try the steps in this article:
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
If you're still having this issue, can you let us know if you've been able to run First Aid? Do you know if you have a Time Machine backup to protect your data?
Hello and welcome to Apple Support Communities, Thatbooy.
If I understand your post correctly, you are getting a permission error when trying to reinstall macOS. I'd like to help.
Are you able to boot into safe mode? Use safe mode to isolate issues with your Mac
This article will help you resolve the permission issue:
macOS Sierra: Set permissions for items on your Mac
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities. Take care.
I’m not sure, every time I shut it off and turn back on. It goes back to utilities. I haven’t touched the computer in a month and does the same thing. Idk if it’s in safe mode or not
Hi, I have the same problem. Can’t get in safe mode either. Does this mean I can’t change the “permission”?
https://origin-discussions2-us-dr.apple.com/thread/7821152?start=0&tstart=0
“Sierra Update failing due to permissions denied”
Not sure if this is related. Anyway it’s another story with a whitescreened Mac :(.
Stuck in macOS utilities.