In all my terminal sessions on OS X or macOS, if I type who
, in addition to the expected users (all me in various windows) I also always see
_mbsetupuser console ...
Just who is that, and what is he/she doing?
If your Mac has multiple users, you should set up an account for each person so each can personalize settings and options without affecting the others. You can let occasional users log in as guests without access to other users' files or settings.
Select Restart from the Apple menu. It should boot up as if it just came out of the box. The Setup Assistant will walk you through setting up the Mac. Create a new user when prompted, but you do not need to setup iCloud or anything else for that user.
Log in as the root userChoose Apple menu > Log Out to log out of your current user account. At the login window, log in with the user name “root” and the password you created for the root user. If the login window is a list of users, click Other, then log in.
As the name suggests, it is a process associated with setup, which, in this case is running as a result of the upgrade from 10.11.x to 10.[11|12].x+y or from 10.12.x to 10.12.x+y (and may also appear in upgrading from older versions to 10.11.x). This process does not appear after an update to 10.13.x.
Unfortunately, though the "About This Mac" dialog may say that your version is 10.[11|12].x+y, you are in fact effectively between versions, and will get all kinds of odd behavior (repeated requests to unlock the Keychain, connectivity problems, wifi issues, mail synchronization failures, process crashes, etc.) until you complete the installation process, which you should be able to accomplish with a reboot.
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