CORRECTION
Some have pointed out that all Linux is not 100% immune to viruses.
That is correct. Ubuntu is not generic Linux, it is Debian based. All software is stored in a single central repository.
Debian based Linux, requires the manual installation of any virus you decide you simply can't live without, of which only about 28 exist. You would have to
1. edit a file called your sources.list (sudo gedit /etc/apt/sources.list)
2. Import the public key ( gpg --keyserver subkeys.pgp.net --search-keys viruses.com)
3. Type (sudo apt-get update)
4. Type (sudo apt-get install NAMEOFVIRUS)
5. Not to mention, typing in your password about 3 times.
It is possible to turn off some of this security. But note: it is enabled by default.
In summary.
Preventing Viruses in Windows requires adding virus protection.
Getting viruses in Linux requires turning off built-in security.
Not technically immune, but a nods as good as a wink to a blind bat.
~FK
