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I installed Ubuntu 12.04

I then installed Gufw, enabled it and Set every known application setting to "Deny".

I never installed sshdaemon so I think its off.

My machine still responds to pings... but otherwise is it safe now?

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What do you use the machine for? Making a local fileserver safe, making a webserver safe and making a desktop computer safe are all very different topics--especially since the most dangerous component of the latter setup is the human operating it. –  adempewolff Jun 20 '12 at 6:58

2 Answers 2

You are "safe" a clean Ubuntu installation doesn't have any daemons listening by default.

What you need to do is define safe

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You can also find out which ports are still open with nmap scanner:

sudo nmap 127.0.0.1 -p1-65535

where 127.0.0.1 is your external IP (with this specific command you will scan localhost)

and 1-65535 ports range to scan. IIRC by default it scans only something about 1000 ports.

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