[ubuntu] Passwords in 12.04

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http://ubuntuforums.org – I just did a clean install of Ubuntu 12.04 on a new hard drive. 1) I set a password for myself as administrator and would like to change it, because it's too long, but I see no way to do so. 2) When I create another user account, there is no option to set a password, and after "Password," the screen says "Account Disabled." I can choose automatic logon, but the system asks for a password, and the user cannot log in. When I do not choose "Automatic logon," the same thing happens. Please help. (Hardware)