[ubuntu] User account can't fathom passwords

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http://ubuntuforums.org – I'm struggling to get to grips with passwords. I've reinstalled twice to try to sort it but still have problems. I've learnt not to try to get rid of passwords. The current problem is that when I created an additional account (a standard one) it didn't ask me to create a password, so I didn't. I clicked to log on automatically. This works fine: when I switch the laptop on it goes automatically to that standard account. The trouble is when I then go to my admin account, and back again to the standard account, it asks for a password. I've tried 'none' and my admin password, etc but doesn't work. (Hardware)