I guess this has nothing to do with FOG, could be error in the dell software

try to check the configuration file
cat /etc/default/tftpd-hpa

try to click save on the fog settings page related to tftp

for ubuntu 12.04 use
ppa:ubuntu-clamav/ppa

Finally got it to work locally but will test it on clients soon
all I did was to update the source list after removing the old clamav
[LIST=1]
[]sudo nano /etc/apt/sourcelist.conf
[]add this line [COLOR=#0000ff]deb [url]http://ppa.launchpad.net/ubuntu-clamav/ppa/ubuntu[/url] maverick main[/COLOR]
[]then apt-get update
[]then apt-get install clamav
[]then configure /usr/local/etc/freshclam.conf
[]then run fresh clamav
[/LIST]

I guess Clamav version 0.97 on ubuntu 10.04 needs more investigation, I will try to install it using the manual method. cuz the source list doesn’t contain version 0.97 only 0.96!!!