Hi,
there is a problem with this product !
http://store.picbg.net/pubpic/C3/EA/82bdc33b832dc3ea.png
The kernel of avast failed to reinitialised after updating database.The application will be terminated. ??? 
OS Kubuntu 10.04 - Ubuntu
Just read this topic : http://forum.avast.com/index.php?topic=57775.0
fine with command:
sudo sysctl -w kernel.shmmax=128000000
Sounds good.
yes, as stated above - this is just insufficient SHM memory limit on your distro.
regards,
pc