Administrator rights for my original user account restored after being lost
I had problems:
- I mistakingly deleted the administrator rights from my original user account.
- Consequently, I could not unlock my users & group preferences and could not install new applications on my iMac using the name and the password from my original account.
- In particular, I kept getting this message "No such file" when running rm AppleSetupDone from single-user mode.
Here is the solution well described here https://apple.stackexchange.com/questions/347816/no-such-file-when-running-rm-applesetupdone-from-single-user-mode, here There is no administrator account on my m… - Apple Community and here https://apple.stackexchange.com/questions/347816/no-such-file-when-running-rm-applesetupdone-from-single-user-mode
In my case the problem was in the symbols " /" in the command "/sbin/mount -uw /" which was written wrong way "/sbin/mount -uw" (without " /" in the end) in the initial instruction here: I can not unlock my users & group prefere… - Apple Community
iMac 27″
