I have some things i have to point out here:
1. I just want to point this, even if virus isnt very often is as much as around 10% of unix based computers(In Asia) infected! Think about all the new viruses that is being programmed just because of Android(That is linux if im not completely wrong)
2. And how can you know if a program you install here are doing something bad or not? It could be "virus"(trojan) in the program code e.g+++
3. As i pointed is 10% of unix based computers in asia infected(Only 1% or less than that of all computers ofcourse) but since Ubuntu now are a big hit in China/Taiwan(Most of asia) since they struggle badly with Virus infection and attacks(when i was in thailand they said on the news that around 80% of the computers in south-east asia where infected with malicious software!!)
And think about all that worms, trojans, trojanworms ++ that are spreading from them to the west and back(Soon 100% of windows computers will be infected) Specially now with the new "Supervirus/malicius software" Called «Duqu» (Read more about it at https://www.securelist.com/en/blog
Do some of you have a guide to how to find out that you not are hacked the hell out of(When you really are? Because when you are you cant see it, at least not very easy, specially now when more and more do so you connect up on a Remote Desktop that is a true copy of yours) It will say you connect trough the server, back to your computer/network and for a while maybe you can feel the computer struggles since it upload your computer to a remote destination, and everytime you log in to internet(It will say physically, since virtually you can still be connected) Of course this will use much more data to start with, but after your computer have been completly rainbows you can think about your computer as a server(One of a big network) with all services.
This is at least possible with windows, it seems maybe a little hash, but trust me it is more than possibly, it is the new way of doing it. The attacker will have completly full control, and you have no chance of finding it out(Only if you log the network activities with the router to an server or something) But this way if you install lets say ubuntu from Windows, they can really make you think you are installing it(And you really are, just not quite the way you want) "anyting is never as it seems"
could be the scenario here. This is more and more possible now with fibreoptic(100mb/s up and down everywhere) SSD disks, 32gb ram, The technology is litterraly growing to fast for the software.. And we have tried this scenario on our self on lan though, and it seemed frightning realistic, just have some problems with the interface to graphic, but if you spend 100-200.000$ and on some cheap(on and with) but good programmers in asia this is a possibility.. So think about the goverment that spend that much on pencils in week on every damn school in the budget
When the 5% with all the money understand that computers are power, it will become really deangorus on the internet) Remember this is 50% hypothetical, but it is possible to do with a few computers if it is a targeted attack that goes over months!
I wont go as far to mean that is something you need to worry about, at least not yet(but in some years).. Before we tried it i never tought it will work without