Hi and welcome to Nethserver Community,
I updated clamav-unofficial-sigs from epel-testing but couldn’t reproduce the issue.
Do you get more detailed error output when you run it directly:
[ -x /usr/sbin/clamav-unofficial-sigs.sh ] && /bin/bash /usr/sbin/clamav-unofficial-sigs.sh
Are there errors in the logs /var/log/messages or /var/log/clamav-unofficial-sigs/clamav-unofficial-sigs.log ?
If there’s an error in the script you could try to reinstall:
yum reinstall clamav-unofficial-sigs --enablerepo=epel-testing
or downgrade from epel-testing package:
yum downgrade clamav-unofficial-sigs