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This are the instructions for changing the user and home folder:

https://support.apple.com/en-us/HT201548#shortname

I didn't follow this warning:

The administrator account needs to be a different account than the one you're renaming. If necessary, create another administrator account, then remove it when you're done.

Now when I try to unlock admin right on the preferences pane it asks for:

enter image description here

And nothing seems to work.

I know the password for sure since I can login.

I have done ls /Users and can see what should be my old user and that doesn't work, neither does what I set, how can I solve this?

  • Have you since created the second Administrator account? – Ramhound Nov 30 '17 at 17:17
  • @Ramhound how so? I need to login as admin to do so AFAIK. – Trufa Nov 30 '17 at 17:21
  • You indicated that is possible, "I know the password for sure since I can login.", so have you created that second user? – Ramhound Nov 30 '17 at 17:24
  • @Ramhound can login to osx, but I can't unlock admin rights inside preferences. – Trufa Nov 30 '17 at 17:26
  • I assume you can't use root in case like this? – Ramhound Nov 30 '17 at 17:30
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Credit for this goes to grgarside from Ask Different - I don't have administrator account on my mac

You can create a new administrator account by restarting the Setup Assistant:

  1. Boot into Single User Mode + S.

  2. Mount the drive by typing /sbin/mount -uw / then ↩ enter.

  3. Remove the Apple Setup Done file by typing rm /var/db/.AppleSetupDone then ↩ enter.

  4. Reboot by typing reboot then ↩ enter.

  5. Complete the setup process, creating a new admin account.

Once you have a new admin account, you can use it to fix your old one, delete afterwards if no longer required.

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