It's not just a click option like Windows you'll need to use a command prompt and su.
It depends on what you're running and how you have it setup.
Use the Ubuntu software center as it's all rated. I will tell you though that AV in a Linux box is about useless unless you're intentionally going after one. Last count I saw said there were less than 1000 viruses written to target Linux. They're not just out there for people to attempt to use and built into web browsers you have to basically be targeted.
The first thing I would do is get an IRC client, join freednode, register your NIC and then join #ubuntu and #linux. Most of the stuff in there will be higher level but if you read what they're saying enough it will start to make sense.
Also avoid the pit trap of making Ubuntu just windows 2.0. Learn to use it as it's meant to be used. The more linux you start to comprehend the sooner you can get onto a distro that is less cookie cutter and more refined.
It depends on what you're running and how you have it setup.
Use the Ubuntu software center as it's all rated. I will tell you though that AV in a Linux box is about useless unless you're intentionally going after one. Last count I saw said there were less than 1000 viruses written to target Linux. They're not just out there for people to attempt to use and built into web browsers you have to basically be targeted.
The first thing I would do is get an IRC client, join freednode, register your NIC and then join #ubuntu and #linux. Most of the stuff in there will be higher level but if you read what they're saying enough it will start to make sense.
Also avoid the pit trap of making Ubuntu just windows 2.0. Learn to use it as it's meant to be used. The more linux you start to comprehend the sooner you can get onto a distro that is less cookie cutter and more refined.