Install Latest version of Opera browser under Ubuntu

Opera 12 comes with more than just these features. Numerous other tweaks, tricks and tucks make this Opera version the best yet:

 * Plug-ins run in their own process, so if they crash, Opera keeps singing.

 * Giddy-up: Opera 12 receives a significant speed boost — faster page loading, faster start up and faster HTML5 rendering — over its predecessor. 64-bit support on Windows and Mac gives better performance on more advanced machines.

 * Right-to-left text support and five new languages: Arabic, Persian, Hebrew, Urdu and Kazakh. Opera 12 now comes in 60 total languages.

Installing Opera 12 on Ubuntu:
With Debian- and Ubuntu-based distros, you can use Opera's repository to ensure that your system will always have the latest stable Opera version. Simply add the following line to your sources.list (/etc/apt/sources.list)

deb http://deb.opera.com/opera/ stable non-free

Type the following command to add the public key

wget -O- http://deb.opera.com/archive.key | sudo apt-key add -

Open the terminal and type following command to install Opera 12

sudo apt-get update
sudo apt-get install opera

After successful installation, you can open Opera 12 from unity 'Dash'