Re: What does software REALLY install?
Many services that you install on Linux will add a user, too. The user account will have only the permissions that the service absolutely needs; for instance, install Apache and the user account it creates will only be able to read data from /var/www and respond to socket requests.
I'm sure AVG is doing the same thing. I'd rather it do that than run as root.
There are a lot of "conspiracies" about Vista that are completely untrue; my favourite is "It scans your hardware every 30ms to check that it hasn't changed!".
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.