[ubuntu] Ubuntu 12.04 profile password

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http://ubuntuforums.org – I'm still rather new to Ubuntu so please help!! While trying to resolve an issue with a program I loaded, I had to use my Administrator password. I went to "User Profiles" and selected my profile I saw that my password was gone and was replaced by a shorter password. The current password is not one I set on the Administrator and is five characters long. The password I set is 13 characters. Since I did not set the 5 character password I have no way of knowing what it is. How might I delete this 5 character password and set the proper one in its place? (Hardware)