What security do I need on Ubuntu?

really ! ubuntu /linux are very safe . there are plenty of information on the web about this . but coming from windows i understand . i did the same three years ago. you have a good option in the software center virus scanner clamav , then klamav which is a little more for techies than me . i have had one trogran in three years and clamav got it befor i even knowed i got it .clamav is one of the easyest to install for some one new to linux .but there is around 4 others that work with linux.
 HOPE THIS HELPS!!

sorry that is clamtk and klamav

I first recommend that you apply security updates when they appear in the Update Manager.

Second, having a firewall is a very good idea. There is an easy tool to configure the included firewall in Ubuntu called Gufw. Look for it in the Ubuntu Software Center. Be sure to set Gufw to allow "outgoing" traffic if you can't access your Internet connection.

Third, only install programs from trusted sources. For example, software found in the Ubuntu Software Center is safe and free from viruses.

At this time an anti-virus solution for Ubuntu should not be necessary.

I follow these practices myself, and for the 2 years that I have been using Ubuntu, I have never had any trouble. Ubuntu does not have many of the security issues found in Windows, so you should be safe with what I mentioned here.

Please remember that software from untrusted sources, like random websites on the Internet, can contain viruses. If you choose to install software from a website, make sure you trust the site and know what it is you are installing.

You may also be interested in reading this help page:
https://help.ubuntu.com/10.04/keeping-safe/C/index.html

There you will find more information on keeping your computer safe.

you can also choose avast antivirus from www.avast.com which is released for linux platform also and it is free.

Hi :)

For Ubuntu try "clamtk" but for Kubunut it is "klamav". Quite often packages starting with a K are for Kubuntu whereas G or Gtk is for normal Ubuntu.

It might be worth looking through this guide
https://help.ubuntu.com/community/Antivirus

Also these guides aout SSH
http://www.debian-administration.org/article/SSH_with_authentication_key_instead_of_password

http://www.debian-administration.org/article/Keeping_SSH_access_secure

Good luck and regards from
Tom :)