[fprint] root password

[Lorenzo Caenazzo]

i've installed Fprint correctly on my hp pavilion dv6580ea (under Ubuntu 8.04) and it works fine!
but... after the session log-in if i open a terminal and type sudo <Something> the terminal doesn't request the password (or finger) and execute immediatly the command... and don't request the password for any root application (like Synaptic)... how can i do?

thx Lorenzo
-sorry for bad english-

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