"usb server prevented updates being installed"

I was having this happen also. I figured out that when I set it to update "in an hour" and walked away from the computer, I would come back later to this error message. When I finally allowed it to update right then with me sitting there, I got a dialog box asking to make a choice. It installed the updates and then no more error message. I think now that when I wasn't there to make the choice, it couldn't move forward to complete the update.

I've tried several time to both let the system do an autoupdate in the evening and also to click to install at a precise moment, and both fail. My computer tried to restart and becomes stuck in restart mode, once overnight. I have to manually turn it off, then when it restarts, the update has not occurred and when the desktop appears, it has the same usb server error message as above.

I'm going to try to remove my Brother printer software from my computer and see if that helps. It seems like this is something Mac needs to fix since there are millions of Brother users overlapping with millions of Mac users.

Thanks. I had the same problem after trying to get my update to install. So I followed the advice here and put my Brother folder into the trash. I then installed the update with no problems

and then reinstated the folder. All is working well.

Thanks again

I found this program in "/Library/Printers/Brother/Utilities/Server/USBserver". I just deleted it. I have a wireless connection to my printers, and never use USB.

Do you have a Brother printer? I found this online: https://www.iboostup.com/app/com.brother.utility.usbserver

Probably is legitimate if it's from Brother.

I got the same error message about USBServer and I do have a Brother printer. Thanks for figuring that out!