I removed the password on the one and only administrator account. Now when I am asked to authenticate, I type in the old password and the authentication fails. It also fails if I do not type in any password.
I tried to put the password back by going to settings ->users, but I can't unlock the panel without authenticating.
Is there a way around this problem? How can I put back the password so that I can authenticate?
I am using Ubuntu 14.04 LTS