Do we need to reboot after adding an user to
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In fact the only thing you need is to get a (new) login prompt, so using the following command works:
anyuser$ su -l <user> user$ sudo <thenewlysudoedcommand> ... works...
But if you are logged in as GUI, then you need to logout & login again.
But, as with MOST linux tools you DON'T need to reboot the computer (that's a Windows thing).