hi, you can install automatrix, it will autmatically install just about everything you need to get going. Ubuntu is free software, the free bit means you are free to see the code and help improve it, not you don't have to pay for it. that being the case it doesn't have proprietary software in the base install because you'd then have to pay for it. that's why people use automatrix.
http://www.getautomatix.com/ http://getautomatix.com/wiki/index.p...Page&Itemid=30
i'm sure it mentions it somewhere on the new site, but here's what it will install you for. it's an old post, so it does now work with Dapper - that's what you are using
http://www.ubuntuforums.org/showthread.php?t=114251
Ubuntu is safe out the box. however, you need to enable the extra repositories and do an update. there's a firewall already running in the background called iptables, you can install a frontend for it called firestarter
here are some links you should go through
http://www.ubuntuforums.org/showthread.php?t=114251
use the search box at the wiki to find things
https://wiki.ubuntu.com/