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  1. How can I check that Ubuntu is 100% secure?

  2. Should I install a firewall, antivirus, malware software, or any other security or are their security software programs installed by default?

  • About antivirus check out http://askubuntu.com/questions/10373/do-i-need-to-have-antivirus-software-installed – Parto May 06 '14 at 08:23
  • For the firewall http://askubuntu.com/questions/26736/is-a-firewall-really-necessary-these-days and http://askubuntu.com/questions/22667/why-is-the-firewall-disabled-by-default – Parto May 06 '14 at 08:25
  • Define 100% secure. The only 100% secure machine is in a locked room, not connected to any networks and off. If you are using this for a bank server, you will want to install extra programs. If you are using it to read your mail, the out-of-the-box setup will be fine for you. This cannot be answered unless you explain your requirements. – terdon May 06 '14 at 10:32

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