AVRISP MkII, permission problems with avrdude and Ubuntu 9.04 amd64

Update 2009-07-21: improved rules in this post.
I bought an Atmel AVRISP MkII today, happily plugged it in hoping that my Linux box running Ubuntu 9.04 amd64 would accept it, but I was wrong.
I was told: avrdude: usb_open(): cannot read serial number “error sending control message: Operation not permitted”
After google:ing a bit I found this old [...]

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