You may think that there is no need for antivirus in Linux, so far I don’t think you need active protection, but having the option to scan folders and flash drives is always nice. I also use them to cleanup Windows machines’ hard drives.

BitDefender
BitDefender is my favorite one, you can apply for a free personal licence here, and you can install it by:

# Add the BitDefender repository key to the list of apt trusted keys:
wget http://download.bitdefender.com/repos/deb/bd.key.asc
sudo apt-key add bd.key.asc

# Add the following line to the /etc/apt/sources.list file:
deb http://download.bitdefender.com/repos/deb/ bitdefender non-free

# Refresh your apt cache by running:
apt-get update

# Install the desired BitDefender packages:
apt-get install bitdefender-scanner-gui

ClamAv
ClamAv does have a full GUI, and have many other packages available for servers. The installation for desktop is very simple:

# Install the engine, updater and GUI:
sudo apt-get install clamav clamav-freshclam clamtk

# To also install active protection:
sudo apt-get clamav-daemon 

# To update the virus definitions:
sudo freshclam