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Lanciando il comando sudo freshclam per aggiornare l'antivirus ricevo i seguenti errori, qualcuno sa aiutarmi?

WARNING: Can't query current.cvd.clamav.net
WARNING: Invalid DNS reply. Falling back to HTTP mode.
Reading CVD header (main.cvd): OK (IMS)
main.cvd is up to date (version: 45, sigs: 169676, f-level: 21, builder: sven)
Reading CVD header (daily.cvd): OK (IMS)
daily.cvd is up to date (version: 5777, sigs: 39253, f-level: 21, builder: ccordes)