Ubuntu 11.04 Firewall/Security

Asked by Heath

I am running dual boot Ubuntu 11.04 or Windows Vista HP....more and more booting directly to Ubuntu.
Should I worry about security? I installed under recommendation clamTK :

sudo apt-get install clamav clamtk

when I open ClamTK virus Scanner it says AntiVirus engine and GUI version are both out of date.....how do I get "current" up to date pkg?

Thanks Again For Your Time In This Matter!!

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Ubuntu clamav Edit question
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Solved by:
Alessandro Menti
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Best Alessandro Menti (elgaton) said :

To get the ClamAV virus definitions up to date, open a terminal and use the command:
sudo clamav-freshclam
To update the GUI, follow this link, download the .deb file, double-click on it to install:

I must however note that running an antivirus under Ubuntu is quite useless as of this time. The majority of viruses in the wild can infect only Microsoft Windows systems, Linux/Ubuntu is immune to them. It's more important to check that the Ubuntu firewall is active (use the gufw program for that).

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Heath (heathbaz) said :

Yes indeed, that updated everything, and found Ubuntu firewall /Ubuntu Desktop Guide...I do apologize I am quickly learning that about Ubuntu/Linux security....I have been infected by that Windows Mind Virus...no more!

Thank You For Your Time And Patience.

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Heath (heathbaz) said :

Thanks Alessandro Menti, that solved my question.

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Eliah Kagan (degeneracypressure) said :

Your question's title suggests that you are also interested in knowing about setting up a Firewall in Ubuntu. This is a separate topic from malware scanning. ClamAV is not a firewall.

If you want to know about that too, please post a separate question about that. (You may also be able to find the answers quickly by searching the web, though...)