It is not a question I wouild normally answer but you have been waiting a while.
As it is a new installation and there is no user configuration to lose I would try to work around the problem and add another new user.
As root - yes, I know, that is all you can do
enter the following command in a console
# adduser newname
Put in a password twice as prompted and then you may find that you can log in as an ordinary user. If not post again.