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Wheezy: adding myself to the sudo group using usermod

(On Wheezy) I've been trying to add myself to the sudo group with the usermod command.


As root, I've tried most of the permutations of this:


usermod -a -G sudo <username>


None of them have worked -- any suggestions?


(I have checked using groups (as username), and even have opened fresh terminals. Hmm, maybe I have to reboot? I hope not, I don't want to do that in the near future.)