How do I install simple firewall on my Ubuntu 14.04 laptop? What is difference between Firewall and the proxy setting of the Firefox browser? I am beginner to Linux.
are you sure it is 14.04? that one should be out of date unless you pay for the extended support.
These are 2 unrelated things, which serve 2 different purposes.
Instal Firewall: Open Terminal: sudo apt-get install ufw