Re: installing themes in 12.04?
Where did you get your themes and what themes are you trying to install?
Extracting your themes into .themes in your home folder should work for your user. Putting them into /usr/share/themes just enables theme system wide for all users. Essentially for your purposes they are the same thing.
True freedom requires sacrifice and pain. Most human beings only think they want freedom. In truth they yearn for the bondage of social order, rigid laws, materialism, the only freedom man really wants, is the freedom to become comfortable.