I installed Ubuntu 13.04 four times. After each installation I attempted to log in by clicking log-in instead of guest. In this field I typed the user name and password I established at the beginning of each installation.
Each and every time I received the error message that my password was invalid. I wrote down each user name and password I established and I verified that each one was correct several times. I made several attempts to log in this way and I was never successful. I can enter as a guest but then I don't have access to administrator privileges so I can connect to my WiFi.
When I try to connect with my WiFi I get the Authentication window and I don't have that password so I get now where. I read through many previous posts on this web site to no avail. What am I doing wrong?