1. Download the latest version of Opera Browser here to your Ubuntu desktop and then double-click on the .deb file to install it. The launcher will appear in Applications > Internet. You can create a panel launcher just clicking with the right button and select Add to Panel
2. Install the flash plugin. Open a terminal (click on Applications > Accessories > Terminal) and copy and paste:
sudo apt-get install flashplugin-nonfree
Now you will be able to see flash videos.
3. Install java, to upload pictures to Facebook or run any java application. In a terminal, copy and paste:
sudo apt-get install sun-java6-fonts sun-java6-jre sun-java6-plugin
That's all. Now start (or re-start Opera and enjoy the fastest and safest browser! …