I've been to system settings and to User Accounts. My account is the only one on the system and I have previously been able to UnLock the screen so that I could set my account to login without password prompt.
That didn't make any effect on the system. I still have to enter a password to log in, but now I can't unlock the User Accounts dialog to make any changes at all. What do I need to reset?
note how the unlock box in the upper right hand corner isn't available for selection…
Best Answer
Try
sudo usermod -U usernameto unlock your account.