[ubuntu] SU priveleges on user account

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http://ubuntuforums.org – I am adding a user to my very modest Ubuntu 12.04 system. Currently, there is myself, with administrator priveleges, and one other user. I am not really very experienced with this sort of thing, but was easily able to set up the new user (call him "James") and get a basic amount of functionality going. I told james what his password would be. I began to customize this user's account somewhat, and immediately ran into trouble. For example, I tried to install a CHrome extension under the user's account, but it failed, and I would guess that would be because James has no administ (Hardware)