How do I download and install Opera in 12.04?

I've heard that we can use it. Then how can I install it because I dont see it in the Ubuntu Software Center.

1. To install Opera, simply go to their download page here. Ubuntu will be auto-detected, and click on the big Download Opera button:

   

2. Choose the "Open With" option, and the file will automatically open in Software Center once downloaded:

3. Click on Install in Software Center, enter your password if asked, and then Opera will be installed:

   

In terminal:

sudo sh -c 'echo "deb http://deb.opera.com/opera/ stable non-free" >> /etc/apt/sources.list.d/opera.list'
sudo sh -c 'wget -O - http://deb.opera.com/archive.key | apt-key add -'
sudo apt-get update && sudo apt-get install opera

Detailed up-to-date instructions are available here:

• Opera Browser in the Ubuntu Community Help Wiki
• Can I install Opera from a repository? in the Opera Knowledge Base

Quoting the Opera Knowledge Base:

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.

You can also always get the latest version from http://www.opera.com/download/ but in that case you won't be using the native system tools (apt, aptitude, Ubuntu Software Center) to do updates.

Installing via repository is the recommended way to install Opera according to the Ubuntu Community Help Wiki.