I’ve switched from Windows to Xubuntu 18.04. Does Avast make a anti-Virus for this O/S?
There’s no consumer version for Linux, for the business version see: https://www.avast.com/business/products/antivirus-for-linux
You are probably going to be limited to ClamAV (with or without ClamTK UI) in Linux desktop environment.
It is only a manual on-demand scanner.