Cannot create password for account without one.

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http://askubuntu.com – I have a standard account with no password, then in the terminal it aksed for my password to install a program, I tried just ENTER and the adminstrators password but none worked, then I tried to create a password but I can't cause it says that the current password is wrong, but I haven't made a password yet! what's going on? Any ideas? (HowTos)