Opera is a full-featured Internet tool, most notably a fully standard conforming Web browser. Opera includes pop-up blocking, tabbed browsing, integrated searches, and advanced functions like a password manager, mouse gestures, native Scalable Vector Graphics (SVG) support, an email program, RSS newsfeeds, and IRC chat. It is designed to be fast and highly customizable.
If you want to install opera Web browser you need to edit your /etc/apt/sources.list file and enter the source list and save your file.
sudo gedit /etc/apt/sources.list
deb http://archive.canonical.com/ubuntu dapper-commercial main
Now you need to update your source list
sudo apt-get update
Install Opera in Ubuntu
sudo apt-get install opera
After finishing the installation if you want to open opera go to Applications—>Internet–>Opera and you can see in the following screen
Opera web Browser in action
Opera Version Details
You can install Real player 10 using the same source list
Install Real Player 10 in Ubuntu
sudo apt-get install realplay
After finishing the installation if you want to open realplayer go to Applications—>Sound&Video–>RealPlayer 10 and you can see in the following screen
Realplayer 10 in action