1. Boot into Safe mood of Ubuntu by holding either shift or ESC key.
a. (Ubuntu is the only operating system on your computer), to get the boot menu to show, you have to hold down the Shift key during bootup.
b. For older versions of Ubuntu (9.04 and 8.04), you can press the Escape key during bootup in order to see the boot menu.
2. Select "Drop to root shell prompt option" to go to root shell.
3. ls /home will show all the current users in your Ubuntu.
4. passwd username to change username's password.
5. type "exit" to exit root shell.
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