Currently what is the best Firewall & Internet security for Ubuntu?
closed as primarily opinion-based by Braiam, guntbert, Warren Hill, Eric Carvalho, qbi Nov 5 '13 at 17:32
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Ubuntu has an inbuilt firewall caled
The graphical version for it is
Ufw is installed by default and is one of the strongest firewalls ever
See this Ubuntu Documentation for Firewalls
Regarding an Antivirus software, you dont need one because linux rarely catches a virus.
If you insist on having one for windows files on linux,
Check these Ubuntu documentations for more info
Also see this