How-To Recover password under Ubuntu
Turn your computer on.
Press ESC at the grub prompt.
Press e for edit.
Highlight the line that begins kernel ........., press e
Go to the very end of the line, add rw init=/bin/bash
press enter, then press b to boot your system.
Your system will boot up to a passwordless root shell.
Type in passwd username
Set your password.
Type in reboot