ClamAV is typically updated via a separate package called FreshClam (in Ubuntu, apt-get install clamav-freshclam).
freshclam is a background daemon that updates the AV signatures automatically based on settings in /etc/clamav/freshclam.conf (default us typically to check every hour).

You can control the update frequency from the clamtk window (if it's *very* recent, many distros are behind in this) via advanced|schedule.

If you prefer using a GUI, you might also look at klamav, which is a KDE frontend for clam.  Be warned klamav brings in dazuko and does on-access scanning, which is probably not needed for Linux systems, and may be harmful to system performance and stability.


==Joseph++

betty wrote:
> stupid question alert; please do not read if you have no patience.
> 
> I am using clamAV and clam tk, (3.05) so that i can use the gui.
> it's supposed to have automatic updates, how will i know if it is
> updating it's signatures? [using a gui]
> does it run itself automatically or do i need to do that every so often?
> thanks again for all the help.
> 
> betty i.
> 
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