There is actually a fantastic removal tool that can help you fully uninstall and remove Clam Antivirus with great success and make sure all the now-defunct Registry entries and related files are eliminated automatically with a few clicks. Aside from this software, it can also completely remove other programs like Authentium, Norton, Trend Micro antivirus, Internet Explorer, or Microsoft Office, and similar programs. ClamXav is a popular choice for many longtime Mac fans, and overall the app seems good. It's simple to use, offers basic protection for your Mac and stays out of your way. Given that it is a mac, you should just find the location of clamav application and delete it.
Installing
ClamAV can be found for Ubuntu in the apt repository. Run this command to install ClamAV:
apt-get install clamav
If you need clamd, you may also want to run:
How Good Is Clamav
apt-get install clamav-daemon
If you require support for scanning compressed RAR files you first need to enable the non-free archive, and then you can install the RAR-plugin using:
apt-get install libclamunrar6
There are two classes of clamav packages available for Ubuntu users:
Clamav Mac Download
Released Set
The released set (release, *-updates, and *-security) are patched for security updates. Following extensive testing of clamav and the packages that use it in the backports repository, they may be updated to a newer version. These are official Ubuntu packages and supported by community developers.
Backports
The Ubuntu backports repository will contain the newest clamav version that has been at least lightly tested to work with that version. These packages can be installed by enabling the backports repository on your system.
Ubuntu packages are maintained by Ubuntu MOTU Developers.