avast! Home Edition is a complete anti-virus package, that is is free for registered home non-commercial users. It contains an on-demand scanner with two interfaces (simple for novices and advanced for experienced users), an on-access scanner with Standard Shield (which protects against execution and opening malware programs) and an embedded e-mail scanner which scans incoming and outgoing email messages.
Install Avast Antivirus in Ubuntu
First you need to download the .deb package from here
Now you have avast4workstation_1.0.6-2_i386.deb package.Install .deb package using the following command
sudo dpkg -i avast4workstation_1.0.6-2_i386.deb
This will complete the installation now you need to get the registration key for this you need to fill the on-line form available here and they will send registration key to your mail address
Applications Menu Setup
or this you need to run a script from the following location
sudo ./install-desktop-entries.sh install
This will complete the application menu setup.
If you want to access you need to go to Applications—>;Accessories—>avast!Antivirus