Bit Defender

Bitdefender for Unices is possibly the best and the worst virus scanning software for Linux that I've ever come across.

Its the best because its fast, It finds almost every single virus we throw at it, its reliable and most of all its easy to use.

Its the worst because I've installed it maybe... 15 times across various Linux distributions and to this day I've not had a single installation that worked first time without issue.

Bitdefender will install, but once you update it you will be unable to scan anything.

If you use a GUI to launch it, it will just crash back to desktop with no visible error messages.

If you load if from a terminal BDGUI you will have no messages until it crashes to desktop and then all it will say is Segmentation fault.

Now the only sure fire way I've found of making this work is to totally purge your existing Bitdefender installation, Just remove everything sudo apt-get purge the nuts off it.

Once thats done download the file again from Bitdefenders website, chmod +x the file and then execute it.

Run Bitdefender
Update Bitdefender
Close Bitdefender
Run Bitdefender again and try to scan a file. (It will crash here)

Once crashed follow these steps (Thanks to Mark Greaves @ http://linuxforums.org.uk/index.php?topic=10259.0)

Open a terminal and run:
sudo rm -v /opt/BitDefender-scanner/var/lib/scan/bdcore.so*

Then
sudo su

Then
cat /opt/BitDefender-scanner/var/lib/scan/versions.dat.* |awk '/bdcore.so.linux/{print $3}'|while read bdcore_so;do touch /opt/BitDefender-scanner/var/lib/scan/$bdcore_so;bdscan --update;ln -s /opt/BitDefender-scanner/var/lib/scan/$bdcore_so /opt/BitDefender-scanner/var/lib/scan/bdcore.so;done 
(copy/paste that one, as it's long)

Then
exit

Now try BitDefender with:
bdgui

--
Thank Mark Greaves!