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Firestarter should be in the Mint repositories (Synaptic Package Manager or Software Center); it is for v. 13.
Note that Firestarter is just a front-end for configuring the firewall, but it is a very user-friendly one. Once the firewall is configured, you don't have to run Firestarter for the firewall to be in effect.
Many thanks frankbell for your very prompt response. Managed to get it working but a couple of points if you can help further, it would be appreciated:-
1) When I start the application, a screen appears showing that the firewall status is active but alongside that is another screen stating "Failed to open the system log"
2) Is there a way to ensure that the firewall is always active? When I close the computer down and re-start, I have to manually re-start the firewall.
Apologies if this seems rather banal. Brought up on Windows, now win 7, and I've heard some good reports on Linux, so thought I would give it a go by trying it out on a spare laptop.
One other point if I may - does one need anti-virus and if so, which one.
Thanks again frankbell. Programme I was using was Firestarter. Uninstalled that and have now configured the Linux 14 packaged firewall and using the pre-confugured options it seems to be functioning. The only issue now is that when I switch off and re-start the machine, I have to sign-in to the firewall again and then run it minimised in the system tray.
When you start the firewall program, does it show the firewall as "On"? If so, you don't need to run that little GUI, minimized or otherwise. The firewall should already be on. This is because, unlike in Windows, the iptables firewall is part of Linux, not an add-on that has to be overlayed on the OS.
This article from Ubuntu goes more deeply into how ufw works as well includes some quick ways to check from the command line that it is on: