[kubuntu] Lost username/password, KUbuntu 12.04

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http://ubuntuforums.org – Hi, I have used older versions of Ubuntu previously with no problems, but recently installed Kubuntu 12.04 onto my netbook, and set the option to login without username/password prompt. I was trying to use another version of linux from live usb, which didn't work, but when I went back to the installed O/S, it started to prompt for, what I think, is username and password. I typed in what I thought was correct, but it doesn't do anything apart from put you back to the login screen. I have tried rebooting several time, but this doesn't make any difference. At one point, I did get the GNU GRUB (Hardware)