hi stephane, there is a conflict between nethserver-squidclamav and nethserver-clamscan, because one uses clamav-data and the other uses clamav-data-empty. So your package can not be installed if squidclamav is installed already, which is part of the webfiltermodule. I had to remove the clamav-data-package, install nethserver-clamscan and after that I had to reinstall nethserver-squidclamav. Is it possible to solve this?