Permission Denied in Terminal of Live CD
I'm trying to wipe the hard drive of an old Mac G4 "Graphics" using an Ubuntu 10.10 Ppc live CD and the terminal command of "dd if=/dev/random of=/dev/sda". I simply get a line that says "permission denied". At no time am I asked for a password, but I entered the command "sudo passwd ubuntu" to set a new one and tried entering it first but it says "no command found". I'm obviously missing something basic here - could anyone fill me in? Any other suggestions appreciated.Thanks.
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