That message actually is informative, in that when you see a message like that from a command where you expanded variables, it suggests one or more of your expanded variables may have been unintentionally empty or unset.chgrp: missing operand after ‘guy@guy-Aspire-A515-52:/var/log/freshclam.log’
might need to remove the : after 52 so it should look like
sudo chgrp guy@guy-Aspire-A515-52 /var/log/freshclam.log
If it still does not work try
sudo chgrp root /var/log/freshclam.log
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