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Trouble adding existing user to existing group in ubuntu

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http://unix.stackexchange.com – I was trying to add a user called bill to www group useradd -G www bill It gives me error UX: useradd: ERROR: bill is already in use. Choose another. I checked if this user already in the group www by typing this command group bill it resulted bill:bill Which means he is not in www group but still i keep getting the error Later I realized from this link that there are different commands to add existing user to existing group and adding a new user to new group. So I tries this command to add bill (an existing user) to www (an existing group) usermod -a -G www bill It gives me s (HowTos)