Ubuntu Oneiric provides a very simple 'User Accounts' dialog which misses quite a few important features. It only lets you choose between an 'Administrator' or a 'Standard' account when you are creating/modifying an account. What if you want to add a user to a certain existing group? It doesn't even list the groups, modifying those groups is out of question then. The only option left is to modify the groups from the command-line.
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