Those were good suggestions. I really thought one of them would work. I even tried using Caps but no luck. Thanks for the suggestions.

If what google01103 suggested doesn't work it is likely that the keyboard layout was changed. Try typing your password in the "user" field and see whether the outcome is as expected.

If Kubuntu really has lost your password there are a number of ways to change the root password if you have physical access to the machine (which clearly you have). On the other hand, you may prefer a new install...

Toad
I saw your response last night. I have been thinking about a new install all night. What concerns me is that this Acer in a dual boot machine and the Windows side of the machine is working perfectly. I do not like the thought of losing the Windows side of the machine. If I do a new install what is the risk of losing the Windows side? Am I going to have to choose between using this machine as either a Windows machine or a Linux machine?At this moment the machine is only usable as a Windows machine. I am doubtful if it is possible to crack the user name and password because when I type the user name every letter I type is echoed back on the screen. When I type the password nothing is echoed to the screen and it just sits there until I type 'enter'. I would think that at least something would be echoed back to the screen when I type in password. What do you guys think?
Thank you for your help.

If you have access to a Live CD environment, then you should be able to chroot into the existing system installation and change a user password using that method.

It would also be interesting to examine the /var/log/messages file of the existing system installation, to determine if the inability to login is a PAM misconfiguration error.

Either what bcooksley suggested or boot into runlevel 1, mount / rw and change your password.

If any of that is too much simply install the new Kubuntu over the old one into the same partition.

I am new to Linux. I am concerned about another reinstallation because I am afraid that I will mess up Windows side. I will try that as a last resort after I have backed up everything. As for the suggestion of booting up in a live CD and chroot into the existing system sounds promising. Could I get some more details on that process please? Thank you

last time I used the arch wiki page - excellent

Thank you for that website arch wiki. I am able to boot from a CD. I can then get to the files on other system. I am unable to find the login and passwd locations to change them. Can anyone help me out here? Thank you