No need to use any anti virus software for ubuntu. For Linux there is no such a risk frim Virus. But sometimes people are using some anti virus software to detect windows viruses. For Ubuntu or other Linux distribution no need any anti virus or Internet security software. Spam Controlling software and Firewall software is enough for security
Avast! Home Edition is a complete anti-virus package,that is chargeless for registered home non-commercial users. It contains an on-demand scanner with two interfaces, an on-access scanner with Standard Shield and an embedded e-mail scanner which scans incoming and outgoing email messages.
No anti virus need for Ubuntu or other Linux versions
I think Kaspersky is the best antivirus for our computer.It help to scan file and folder from computer.This anti virus help to protect our computer against virus.This is very strong antivirus compare to other anti virus.
I heard there are some antivitus programme are available for Linux. I hope those will work with Ubuntu also.