Reading from http://www.ubuntu.com/desktop page.
"Secure
With a built-in firewall and virus protection software, Ubuntu is one of the most secure operating systems around. And the Long Term Support releases give you five years of security patches and updates."
I have found the built in firewall but have yet to discover the control panel for the “built in Virus protection”.
I see from the FAQ that “Ubuntu MATE 15.04 and onward are official Ubuntu flavours.”
Was this function removed for Mate 15.10?