What is a good virus scan & spyware removal program for Ubuntu (LINUX)?

[Frederickson]

I am new to using linux and i would like to have a secure computer.

For Windows XP i have:
FREE AVG 7.5
Ad-ware 2007
Spybot
Zone Alarm

Now for ubuntu(linux) What free virus/spyware/firewall software would be compatible with ubuntu(LINUX)?

 

[BluePlum]

There are no Known viruses for ubuntu. So u dont need one, There are some tho.. But u dont need one. So all you need is a firewall ( which you dont realy need ) to be safe. Ubuntu=Virus Safe