Neal, All you need to do is change to a virtual terminal and issue "sudo passwd ubuntu" to set a new known password then return to the X display and enter the new password to unlock, however a novice user is unlikely to know to do this!
Neal,
All you need to do is change to a virtual terminal and issue "sudo passwd
ubuntu" to set a new known password then return to the X display and enter the
new password to unlock, however a novice user is unlikely to know to do this!