Effectively, not possible! Linux/Unix passwords are encrypted with (at the minimum) with 56-bit DES encryption, and they are one-way encrypted (no way to determine plain-text from encrypted version). My suggestion is to boot with a recovery CD/DVD/USB drive, mount your root file system, and set the user password to blank in /etc/shadow. Then boot, login (no password needed) and reset the password.
You can download a recovery and/or live CD/DVD from the distribution web site for your version. When you boot from the CD/DVD, login as root. Then you will create a mount point (directory) for the system / directory, such as: mkdir /mnt/rootfs
Finally, you will mount the root file system, assuming it is the 3rd partition on the system drive, as: mount /dev/sda3 /mnt/rootfs - at this point you can access your shadow password file (a text file) which would be /mnt/rootfs/etc/shadow
In any case, get the recovery/live CD/DVD, get to where you can boot up and logged in as the root user. Then we can help walk you through the process in detail.
Hi rubberman: Just wanted to let you know that my neighbor fixed my computer. He uninstalled UBUNTU for me. Much better now. Thank you so much for your time and effort in trying to help me. Much appreciated.