This annoying message popped up after I ran the update in avast! in Ubuntu yesterday. avast! crashes every time I attempt to launch it after that. Did some googling and someone suggested deleting a file called "400.vps" in the ".avast" folder. I did just that and avast! was able to launch again. However, the same error occurs immediately after the virus definition update is performed. There is an error with the signature file. Hmmmmmm. What happened to quality control nowadays?
Update: I resolved the update issue. Run the following command.
commandrine@bridge:/$ sudo sysctl -w kernel.shmmax=128000000
kernel.shmmax = 128000000
I combined this command and the avast! update command together in this script to simplify matters. You no longer need to launch the avast! GUI to start the update. Download it here.