Antivirus is completely unnecessary and terrible on windows and linux... and on linux it's uniquely useless. Everything is installed from a centralized repo, antiviruses won't be of any help at all. antiviruses came about because windows let executables just be run easily and simply and used them as the default way of installing software, this was beyond idiotic and the reason that OS became infested with malware. Linux never made that mistake from the start, and so antivirus is unnecessary.
Norton is basically just malware, however.