Ubuntu one of the leading operating system.There is no need of anti-virus software for ubuntu because viruses that attack ubuntu is very rare.But still if you want to install anti-virus software that your sharing your files to windows and mac systems then you can install anti-virus software.But no need to install any anti-virus software for ubuntu.This is very useful for software engineering students because they can learn programming languages through terminal it is very easy to use and very speed.And also you can run windows applications in ubuntu after installing wine in ubuntu.